Successful Aging,Social Support,and Ownership of a Companion Animal

Studies consistently find that higher levels of social support improve the psychological and physiological health of older people, but findings from empirical research are mixed regarding the presence of a “pet effect”— the idea that living with an animal can improve human health, psychological wellbeing, and longevity. We examined the assocations among social support, dog and cat ownership, and successful aging in a panel of 5,688 people between the ages of 50 and 74 years. Utilizing GLM, we tested for the presence of a complement (independent or additive effects) and/or hydraulic (interactive effect) association of pets and human support on four indicators of successful aging (pain, functional ability, chronic illnesses, and subjective successful aging). Supporting the hydraulic hypothesis, we found that having a dog was associated with fewer chronic illnesses, higher functional ability, and higher levels of subjective success when people lack human support. Similarly, having both a dog and a cat was associated with higher functional ability, less pain, and higher levels of subjective success when people lack human support. Supporting the complement hypothesis, we found that having a cat was associated with more chronic illnesses and lower levels of subjective successful aging. Findings carry practical implications for supporting pet ownership of older people, suggesting that dogs have a positive association with successful aging.     

Exploring mechanisms of sex differences in longevity: lifetime ovary exposure and exceptional longevity in dogs

To move closer to understanding the mechanistic underpinnings of sex differences in human longevity, we studied pet dogs to determine whether lifetime duration of ovary exposure was associated with exceptional longevity. This hypothesis was tested by collecting and analyzing lifetime medical histories, age at death, and cause of death for a cohort of canine ‘centenarians’– exceptionally long‐lived Rottweiler dogs that lived more than 30% longer than average life expectancy for the breed. Sex and lifetime ovary exposure in the oldest‐old Rottweilers (age at death, ≥ 13 years) were compared to a cohort of Rottweilers that had usual longevity (age at death, 8.0–10.8 years). Like women, female dogs were more likely than males to achieve exceptional longevity (OR, 95% CI = 2.0, 1.2–3.3; P = 0.006). However, removal of ovaries during the first 4 years of life erased the female survival advantage. In females, a strong positive association between ovaries and longevity persisted in multivariate analysis that considered other factors, such as height, body weight, and mother with exceptional longevity. A beneficial effect of ovaries on longevity in females could not be attributed to resistance against a particular disease or major cause of death. Our results document in dogs a female sex advantage for achieving exceptional longevity and show that lifetime ovary exposure, a factor not previously evaluated in women, is associated with exceptional longevity. This work introduces a conceptual framework for designing additional studies in pet dogs to define the ovary‐sensitive biological processes that promote healthy human longevity.     

Carnivorous Cats,Vegetarian Dogs,and the Resolution of the Vegetarian's Dilemma

The present research sought to further clarify the vegetarian's dilemma, the conflict that pits feeding one's pet an animal-based diet that may be perceived as best promoting their well-being with concerns over animal welfare and environmental degradation threatened by such diets. It specifically examined whether non-meat eaters would distinguish between pet dogs and cats in the percentage of their diet derived from animal products, guilt experienced from such diets, and perceived appropriateness of non-vegetarian diets. Survey responses from 290 vegans and vegetarians indicated that participants fed their pet dogs a diet significantly more vegetarian than they fed their pet cats, and reported experiencing less guilt feeding their cats a diet derived highly from animals than in feeding their dogs such a diet. This lack of guilt largely arose from greater endorsement that vegetarian diets were more inappropriate for cats than dogs. For dogs, then, the vegetarian's dilemma was resolved primarily through feeding them diets reduced in meat/fish. For cats, the primary attempt at resolving the dilemma was not behavioral but perceptual in that vegetarian diets were deemed inappropriate. As discussed, this latter strategy was met with mixed success. Overall, the reaction of participants reflected prevailing medical wisdom that vegetarian diets are somewhat acceptable for dogs but problematic for cats.     

The Use of Positive Reinforcement in Training Zebra Sharks (Stegostoma fasciatum)

Few studies have examined how personality traits may be related to the amounts and types of attachments humans have toward companion animals (pets). In this study, 1,098 companion animal guardians (owners) completed a survey that included the Big Five Inventory, the Lexington Attachment to Pets Scale, and the Pet Attachment Questionnaire. Each participant chose whether he or she identified as a Cat Person, Dog Person, Both, or Neither. Results indicated that neuroticism, conscientiousness, choosing a dog as a favorite pet, and identifying as a Cat Person, Dog Person, or Both predicted affection for a pet. Conscientiousness, extraversion, and openness decreased avoidant attachment to pets, and neuroticism increased anxious attachment to pets. Both dogs and cats could benefit from pet owners who are conscientious, and there may be some benefits of neuroticism in pet owners. The findings of this study will advance understanding of the human–animal bond. As this understanding increases, measurements of human attachment and personality may be useful for the development of tools that could assist shelter employees and veterinarians in counseling people about pet ownership.     

Pet owner behaviors and attachment to yard versus house dogs

Abstract

The majority of research on the human–nonhuman animal bond has considered its advantages for the human. Research investigating the benefits of the bond for the companion animal has focused primarily on the relationship between owner attachment and the relinquishment or abandonment of pets. Shore, Douglas and Riley (2005) compiled a list of 67 behaviors of pet owners of potential benefit to the dog or cat, categorized the behaviors as Essential, Standard, Enriched, or Luxury Care, and studied the relationship between these behaviors and a measure of attachment. The present study continues the investigation of more routine pet-keeping activities by examining the prevalence of such behaviors among a subset of dog owners who keep their dogs out of doors as compared with those whose dogs live primarily in the house. Participants were 322 largely non-traditional college students at a university in the Midwestern United States. Scores on two attachment measures were significantly higher for owners of house dogs as compared with those of owners of yard dogs. Although the majority of both house and yard dogs received basic care, fewer yard dogs received as high levels of attention to some of their physical and safety needs. The gap between yard and house dogs widened as the category of care moved from Essential to Enriched. Involvement in agility training, being taken to events for pets, and exercising with a member of the family were notable exceptions, in that they occurred in equal proportions for yard and house dogs, and perhaps represent opportunities for yard dogs to be in closer contact with a human caretaker. The results suggest that adoptions of sheltered or rescued dogs to people who plan to keep the pet outside can be made with confidence that the dog will be cared for, but that programs to educate the public on the social needs of dogs and the benefits of keeping dogs indoors might result in increased attention to the needs of the animals, strengthening of the human–nonhuman animal bond, and reduction of relinquishment.     

犬、猫与人类心血管疾病的特点比较

随着我国小动物诊疗行业与国际兽医临床技术的接轨,国内的兽医学科向专科方向发展,小动物心血管疾病在老年动物呈现出越来越高发的迹象,临床兽医在心血管疾病的研究也越来越深入,也更多的借鉴了人类心脏病学的诊疗检查手段,通过将犬猫心血管疾病特点与人类相比较,发现两者之异同,希望能籍此指导犬猫心血管疾病诊疗,满足动物主人的需求,维护动物健康,缓解给动物主人所带来的焦虑,体现兽医在维护人类身心健康的作用。     

Attachment Anxiety and Avoidance Influence Pet Choice and Pet-directed Behaviors

Attachment theory is a useful lens through which to examine both perceptions and selection of companion animals. Study 1 compared perceptions of dogs and cats, and found that dogs were perceived as having more positive relationship qualities and secure attachment-related characteristics, whereas cats were perceived as having more negative relationship qualities and avoidant attachment-related characteristics. In addition, people perceived relationships with dogs to involve less avoidance and less anxiety relative to relationships with people. In study 2, which built on the findings of study 1, attachment avoidance was negatively associated with wanting to own a pet, whereas attachment anxiety was positive associated with wanting to own a pet. These attachment dimensions were not associated with wanting to own a dog, but lower avoidance and higher anxiety were associated with wanting to own a cat. Study 3 was a longitudinal study of SPCA-type shelter visitors (510 participants, with 169 reporting a recent pet adoption). Lower attachment anxiety predicted recently adopting a dog rather than a cat, though neither anxiety nor avoidance predicted adopting a cat. Individuals who wanted a pet in order to facilitate human relationships were more likely to adopt a dog than a cat. Those high in attachment avoidance reported turning to their pet as a replacement for human companionship, and those high in attachment anxiety reported feeling more concern about their pets requiring more attention. Attachment anxiety and avoidance may influence the decision whether or not to adopt a pet, as well as the motivation underlying the adoption choice. Attachment also may influence the type of pet chosen (i.e., dog versus cat). In addition, attachment may influence the nature of the human–animal relationship, such as the time spent together, and the security felt regarding the relationship.     

Species differences in tumour responses to cancer chemotherapy

Despite advances in chemotherapy, radiotherapy and targeted drug development, cancer remains a disease of high morbidity and mortality. The treatment of human cancer patients with chemotherapy has become commonplace and accepted over the past 100 years. In recent years, and with a similar incidence of cancer to people, the use of cancer chemotherapy drugs in veterinary patients such as the dog has also become accepted clinical practice. The poor predictability of tumour responses to cancer chemotherapy drugs in rodent models means that the standard drug development pathway is costly, both in terms of money and time, leading to many drugs failing in Phase I and II clinical trials. This has led to the suggestion that naturally occurring cancers in pet dogs may offer an alternative model system to inform rational drug development in human oncology. In this review, we will explore the species variation in tumour responses to conventional chemotherapy and highlight our understanding of the differences in pharmacodynamics, pharmacokinetics and pharmacogenomics between humans and dogs. Finally, we explore the potential hurdles that need to be overcome to gain the greatest value from comparative oncology studies.     

Introduction to the Themed Issue on Human–Animal Interaction and Healthy Human Aging

ABSTRACT

In 2016, the Gerontological Society of America (GSA) developed a research focus on the benefits and potential risks associated with pets among older adults. With the goal of developing a roadmap for human–animal interaction (HAI) research in older people residing in both the community and institutions, GSA convened a workshop of international experts and policy-makers in the fields of aging and HAI. The status of current knowledge was shared on the success factors for healthy aging and the potential challenges (GSA, 2016). Participants considered what roles pets might play in the lives of older adults and their potential to mitigate loneliness, social isolation, and depression, and to enhance mobility and cognitive function. Existing research was shared to provide insights into the ways in which pets can impact older adults and their caregivers and to identify where further research is needed. This paper introduces a series of papers from that meeting, with some additional papers from meeting attendees to expand on the topics covered and provide key perspectives and gaps in information needed, as a foundation for those considering research into this topic. Although HAI/Animal-Assistant Intervention (AAI) research is in its infancy, there is some evidence that pet ownership or animal interaction can have major benefits for many older adults. At the same time, there are some risks to both the pet and the older adult that need to be addressed. Innovative approaches to both AAIs and the ways to overcome challenges are presented in this themed issue of Anthrozoös. Our hope is that the findings from these reviews and reports will stimulate additional work in this area.     

Pet owners' views of pet behavior problems and willingness to consult experts for assistance

Prior research has found that dog obedience training and the receipt of advice regarding companion animal (pet) behavior reduce the risk of nonhuman animal relinquishment to an animal shelter and increase human-companion animal interactions, but research also finds that only a minority of pet guardians participates in such activities. The researchers for this study asked 170 dog and cat guardians to assess the seriousness of common problem behaviors and how likely they were to seek help. The researchers also asked them to rate different methods of obtaining expert advice. The dog and cat guardians saw behaviors directly affecting humans as most severe; those involving the destruction of property were next in severity; and those affecting the animal more than the human were least severe. There were no significant differences in ratings by participants' gender or income. Participants indicated they were more likely to use free help options than fee-based services. The lack of a clear correlation between the seriousness of a behavior problem and likelihood of seeking help suggests that other factors may play a role in pet guardians' interest in obtaining expert advice.     

An Investigation of the Rusbult Investment Model of Commitment in Relationships with Pets

The present research examines relationships between people and their pets through the lens of the Rusbult Investment Model. The Rusbult Investment Model identifies important antecedents to commitment in a relationship: satisfaction with the relationship, quality of alternatives to the relationship, and investments in the relationship. In turn, commitment predicts enactment of behaviors that involve forgoing one’s own needs to benefit one’s relationship. Among these behaviors are forgiving transgressions, accommodating undesirable behaviors, and sacrificing for the sake of one’s relationship partner. Recent research has revealed that pets benefit humans through conferral of social support. By examining commitment processes in human–pet relationships, relationship duration may be maximized, leading to greater benefits for both the human and the pet. The present research surveyed pet owners about their relationship with their pet (e.g., feelings of commitment, investment) and their willingness to engage in pro-relationship behaviors (e.g., forgiveness, accommodation). Regression analyses revealed that human–pet relationships operate in a similar fashion to human–human relationships in terms of both the predictors and outcomes of commitment. This effect was observed across a range of behaviors, among different types of pets (i.e., dogs, cats, and one fish), and in the context of both current and former relationships. These results suggest that increasing satisfaction and investments and decreasing the perceived quality of one’s alternatives, either individually or in tandem, may benefit human–pet relationships. The findings are discussed in terms of the role these factors may play in pet abandonment and its costs to animal wellbeing. This discourse erects a call for experimental and intervention-focused research that might draw upon both the present and past research on commitment to pets.     

Pet Ownership and Human–Animal Interaction in an Aging Population: Rewards and Challenges

ABSTRACT

Older adults in most developed countries can now expect to live nearly 80 years without significant disability. To maximize the quality of the years after retirement, societies, governments, and organizations are seeking strategies to help older adults maintain their mental and physical health, and retain their independence. Increasingly, the impact of pet ownership and other forms of human–animal interaction in healthy aging are discussed and investigated. In the Western world, more than 50% of households own one or more pets. The popularity of pets means they are well positioned to provide opportunities for companionship and nurturance. Since social networks tend to decrease as people age, pets may fill some gaps. While it is common to read about the benefits of pets and human–animal interactions, pet ownership in older age is also related to challenges and animal welfare concerns. This paper aims to briefly review the benefits and then explore risks and challenges related to pet ownership in older adulthood. In addition, we present strategies for maintaining beneficial pet ownership and human–animal interaction for older adults.     

Returning a recently adopted companion animal: adopters' reasons for and reactions to the failed adoption experience

The return of a recently adopted companion animal places the nonhuman animal in jeopardy and may be painful and frustrating to the humans involved. However, if returners learn from the failed adoption experience, future adoptions may be more satisfactory for all concerned. In this study, 78 people who had adopted and returned dogs or cats to an animal shelter in a U.S. Midwestern city were interviewed regarding their reasons for return, reactions to the experience, and plans for future adoptions. Although some returners adjusted their pet ownership plans in potentially beneficial ways, most reacted by counseling greater forethought and planning before adopting. The last, although sound advice, had little to do with reasons for return, which primarily were problems that arose postadoption: pet behavior such as not getting along with other pets or children. Changing expectations about the development of new pet-family relationships and the provision of postadoption services might help adopters tolerate the adjustment period and handle problems without resorting to returning the animal.     

Reasons for Relinquishment of Companion Animals in U.S. Animal Shelters: Selected Health and Personal Issues

In personal interviews, people surrendering their dogs and cats to 12animal shelters in 4 regions of the country discussed their reasons for relinquishing their companion animals and answered questions about their own characteristics and those of their pet. The interviews identified 71 reasons for relinquishment. Personal issues lead the class of reasons for relinquishment of cats and ranked 3rd among those given for relinquishment of dogs. The top 3 health and personal issues cited for giving up cats were allergies of a family member to cats, owner's personal problems, and anew baby. For dogs, the top 3 reasons cited were lack of time for the dog, owner's personal problems, and allergies. Analysis of these health and personal issues suggests that education and counseling before and after acquisition of a pet, as well as the availability of temporary accommodations for pets during times of personal crisis, may reduce relinquishments.     

Do large dogs die young?

In most animal taxa, longevity increases with body size across species, as predicted by the oxidative stress theory of aging. In contrast, in within-species comparisons of mammals and especially domestic dogs (e.g. Patronek et al., '97; Michell, '99; Egenvall et al., 2000; Speakman et al., 2003), longevity decreases with body size.We explore two datasets for dogs and find support for a negative relationship between size and longevity if we consider variation across breeds. Within breeds, however, the relationship is not negative and is slightly, but significantly, positive in the larger of the two datasets. The negative across-breed relationship is probably the consequence of short life spans in large breeds. Artificial selection for extremely high growth rates in large breeds appears to have led to developmental diseases that seriously diminish longevity.     

The impact of mitochondrial DNA on human lifespan: a view from studies on centenarians

The role of inherited and somatic mutations of mitochondrial DNA (mtDNA) in aging and longevity is complex and highly controversial, owing to its peculiar genetics, including the phenomenon of heteroplasmy. Most of the data on mtDNA and longevity have been obtained on humans and particularly on centenarians, i. e., people who escaped or delayed the major age-related pathologies and reached the extreme limit of human lifespan. In this review we summarize the most recent advances in this field that suggest a consistent role in human longevity of both germ-line inherited and somatically acquired mutations. The particular case of the association with longevity of the somatic C150T mutation is extensively discussed, challenging the tenet that mtDNA mutations are basically detrimental. We also stress several limitations of our present knowledge, regarding the difficulty in extrapolating to humans the results obtained in animal models, owing to a variety of biological differences, including the very limited genetic variability of mtDNA in the strains used in laboratory experiments. The use of high-throughput technologies and the extensive analysis, possibly at the single cell level, of different tissues and cell types derived from the same individual will help in disentangling the complexity of mtDNA in aging and longevity.     

Companion animal adoption study

To better understand the outcomes of companion animal adoptions, Bardsley & Neidhart Inc. conducted a series of 3 surveys over a 1-year period with dog and cat owners who had adopted their pet through either a (a) Luv-A-Pet location, (b) Adopt-a-thon, or (c) traditional shelter. This article suggests opportunities to improve owners' perceptions of their pets and the adoption process through (a) providing more information before adoption about pet health and behaviors, (b) providing counseling to potential adopters to place pets appropriately, and (c) educating adopters to promote companion animal health and retention. Results demonstrate that the pet's relationship to the family unit, such as where the pet sleeps and how much time is spent with the pet, is related to the amount of veterinary care the companion animal receives, and to long-term retention. Satisfaction and retention are attributed to the pet's personality, compatibility, and behavior, rather than demographic differences among adopters or between adoption settings. The age of the companion animal at adoption, the intended recipient, and presence of children in the home also play a role. Health problems were an issue initially for half of all adopted pets, but most were resolved within 12 months. Roughly one fourth of adopters who no longer have their companion animal said their pet died. Characteristics of pets that died support the contention that spaying and neutering profoundly affects a companion animal's life span. Although retention is similar for dogs and cats, mortality is higher among cats in the first year after adoption.     

犬营养代谢病

宠物指人们精心饲养,以供玩赏愉悦的宠爱动物。目前犬类在我国宠物市场发展较为迅速,而且历史非常悠久,其他宠物的饲养规模、普及程度与犬类还相距较远。对国内犬临床疾病情况研究发现,近年来犬营养代谢性疾病发生率逐年升高,广大宠物医师对于此类疾病的关注程度日益加大。本文主要从犬营养代谢病的发病原因、临床较为先进的诊断方法、后期治疗饲养,三个方面进行对犬营养代谢病进行探讨,希望对于宠物市场在我国的发展、临床治疗此类疾病和宠物营养的科学搭配提供指导和帮助。