The effects of the presence of a dog in the classroom

Abstract

This study examined the effects of the presence of a dog in the classroom on field independence, social competence, empathy with animals and social-emotional atmosphere. The participants were 46 first-graders (43 of them immigrants) of two school classes (control and experimental). In the experimental group, a dog was present in the classroom for three months. Multivariate analyses revealed significant enhancement of field independence and empathy with animals in the experimental group in comparison to the control group (no dog). Thus, the presence of the dog fostered the development of autonomous functioning and a better segregation of self/non-self, which is the foundation of sensitivity towards the needs and moods of other people. Moreover, according to the views of the teachers, the children in the experimental group exhibited higher social integration, and there were fewer aggressive children, compared with the children in the control group. In sum, the results indicate that a dog can be an important factor in the social and cognitive development of children.     

Beagle犬的基础数据

目的检测不同性别年龄段Beagle犬的血液学和血生化指标,解剖称量分析8～12月龄Beagle犬脏器重量、系数等基础数据,为实验用Beagle犬的应用与研究提供参考数据。方法采用HITACHI-7020自动生化分析仪和SWELAB—AC920EO血球自动分析仪,检测了3000多只次不同性别和年龄的健康Beagle犬的血液学和血生化数据;解剖128头Beagle犬,称量及计算正常Beagle犬各内脏器官重量及系数。结果和结论获得正常Beagle犬的血液学RBC、HCT、MCV、RDW、HGB、MCH、MCHC、PLT、WBC、LYM、MID、GRA等指标正常值及标准差,血生化ALT、AST、ALP、TP、ALB、BUN、CREA、GLU、TCHO、TBILI、TG等指标正常值及标准差;获得Beagle犬心脏、肝脏、脾脏、肺脏、左右肾、脑、肾上腺、胸腺、甲状腺、睾丸、前列腺、子宫、卵巢等内脏器官的重量和系数正常值及标准差。     

Effects of diet on captive black-footed ferret (Mustela nigripes) food preference

Black-footed ferrets (Mustela nigripes) are both habitat and prey specialists that depend on prairie dogs (Cynomys spp.) for food and utilize prairie dog burrows for refuge. In this study we investigated the effects of captive diet during early development on adult black-footed ferret food preferences. To test the hypothesis that early diet affects the food preferences of adult black-footed ferrets, we exposed 22 kits (divided into three experimental groups) to different quantities of prairie dog in the diet: no prairie dog, prairie dog three times per week, and prairie dog daily during the assumed sensitive period for olfactory imprinting, i.e., between 60–90 postnatal days. At age 5 months, kits were individually tested in a food choice cafeteria trial. Results indicated that higher amounts of prairie dog in the ferrets' early diet led to a higher preference for this food item when ferrets reached adulthood. These results have important implications for black-footed ferret recovery and have been considered in the reintroduction protocol. © 1996 Wiley-Liss, Inc.     

Genetic and environmental factors affecting the suitability of dogs as Guide Dogs for the Blind

Summary Many dogs are found to be unsuitable for training as guide dogs for the blind. Consequently the Royal Guide Dogs for the Blind Association of Australia has embarked on a breeding program to produce a strain of labrador dogs which is suitable for guide dog training.The most common reasons for rejecting dogs are fearfulness, dog distraction, excitability, health and physical reasons and hip dysplasia. The selection program seems to have been successful in improving the success rate mainly by lowering fearfulness, but there has not been a continuing improvement. This is probably due to continual introduction of dogs from other populations into the breeding program.Males suffer from a higher rejection rate due to dog distraction and a lower rejection rate due to fearfulness and excitability than females, so that there is little sex difference in overall success rate.The heritability of success (0.44) is high enough to predict further progress from selection, again mainly against fearfulness.Variation in environment prior to 6 weeks of age, in age when dogs were placed into a private home and in age when males were castrated, had little effect on the success rate.     

Variations in the staining of cutaneous mast cells

Synopsis Mast cells of dog skin were examined by staining with Alcian Blue in magnesium chloride solutions and by a periodic acid-Schiff method. The results suggest that the usual fall in cell-count with age is largely due to increasing blockage of staining by protein-saccharide interaction. The degree of sulphation and molecular weight of the saccharide polymer appears to be reduced with age in animals with either normal or diseased skin, but in the diseased animals the protein-polysaccharide interaction did not occur. Significant differences between body regions occur, particularly in the anal region. It is considered unlikely that significant amounts of glycosaminoglycans other than heparin are present in dog mast cells.     

The relationship of adult morphology and early social signalling of the domestic dog (Canis familiaris)

Most research on dog communication has focused on either the use of lupine signals during intra-specific interactions or has studied single-breed groups, with little regard to the effects of morphological change in the dog on their communication. This oversight ignores the fact that most modern dog breeds do not resemble the wolf and thus they have lost the ability to send some signals and may encounter communication problems. Using puppies in 40 litters from 32 breeds, we investigated the relationship between the frequencies of behaviours (social signals), and the adult morphology of these dogs. Despite a high level of precision, no statistically significant relationships were found between the deviation of the adult morphology from the ancestral lupine morphotype and early social signalling in the dog. We concluded that any communication loss due to morphological deviation, is not compensated for by increasing the frequency of signalling behaviours at this age.     

Demographic Data of a Population of Insured Swedish Dogs Measured in a Questionnaire Study

Dogs, in the age range 1–3 years old, were randomly selected from the largest animal insurance database in Sweden for inclusion in the study. The study was performed in 1997, and a total of 680 dog owners were selected for the study. A total of 461 dog owners completed the survey, at an overall response rate of 68%. Data was compared to a recent gallup performed on a sample of all dogs in Sweden. The demographic statistics of the insured dog population were in many aspects similar to the total dog population of Sweden. Typical for both insured dogs and the total population of dogs were a low proportion of neutered dogs, that many dogs were bought at an early age, that many dogs were in contact with a "breeder" when sold, and a similar profile of health status. However, "dog breeders" seemed to have their dogs insured to a higher extent than the general dog owner. It was concluded that as the populations were alike in many respects, it is reasonable to use the insurance database for epidemiological studies on diet and exercise in Swedish dogs.     

Dog and owner demographic characteristics and dog personality trait associations

The aim of this study was to analyze the relationships between four personality traits (calmness, trainability, dog sociability and boldness) of dogs (Canis familiaris) and dog and owner demographics on a large sample size with 14,004 individuals. German speaking dog owners could characterize their dog by filling out a form on the Internet. There were five demographic variables for dogs and nine for owners. Two statistical methods were used for investigating the associations between personality and demographic traits: the more traditional general linear methods and regression trees that are ideal for analyzing non-linear relationships in the structure of the data. The results showed that calmness is influenced primarily by the dog's age, the neutered status, the number of different types of professional training courses (e.g. obedience, agility) the dog had experienced and the age of acquisition. The least calm dogs were less than 2.5 years old, neutered and acquired after the first 12 weeks of age, while the calmest dogs were older than 6.9 years. Trainability was affected primarily by the training experiences, the dog's age, and the purpose of keeping the dog. The least trainable dogs had not received professional training at all and were older than 3 years. The most trainable dogs were those who participated in three or more types of professional training. Sociability toward conspecifics was mainly determined by the age, sex, training experience and time spent together. The least sociable dogs were older than 4.8 years and the owners spent less than 3 h with the dog daily. The most sociable dogs were less than 1.5 years old. Males were less sociable toward their conspecifics than females. Boldness was affected by the sex and age of the dog and the age of acquisition. The least bold were females acquired after the age of 1 year or bred by the owner. The boldest dogs were males, acquired before the age of 12 weeks, and were younger than 2 years old. Other variables, including the owner's gender, age, education, previous experience with dogs, the number of people and dogs in the household, and purpose of keeping the dogs had minor, but detectable effects. The results suggest that on-line questionnaires are a very effective means for collecting data about dog behavior, especially if owners are motivated by instant feedback. However, note that the characteristics of dogs in the present study were reported by the owners, and the associations with the traits do not necessarily represent a causal relationship.     

Dog Ownership in the West Indies: A Case Study From the Bahamas

ABSTRACT

Results from several studies in The Bahamas, which included 511 interviews with residents and data on 776 dogs, are reported. The composition and characteristics of the dog population are described. The majority of dogs, both owned and unowned, are local mongrels called “potcakes.” The median age of the dog population is three years. Potcakes are given a lower level of health care than dogs considered to resemble a recognised breed. Many dogs have no place in the household and are able to roam. The dynamics of the owned and unowned dog populations are derived, and abandoned dogs are shown to sustain the free-roaming population. The free-roaming dog population breeds throughout the year but it has a breeding cycle longer than six months, which is probably caused by its ill health. Despite the nuisance caused by unowned dogs, residents are tolerant towards them, and over half the households feed dogs they do not own. The changes in pet ownership required to increase the welfare of dogs are discussed.     

Preschoolers Categorize Animate Objects Better in the Presence of a Dog

ABSTRACT

The current study was designed to examine whether preschool children categorize picture stimuli differentially in the presence of a real dog compared with a stuffed dog or a human. Seventeen preschool children (age in months; M = 51.67, SD = 8.06), both Typical and those with a developmental delay (“Identified”), were asked to categorize Animate and Inanimate objects into two environments (Farm and Ocean) in each of three Collaborator conditions (Real Dog, Stuffed Dog, and Human). As predicted, there was a main effect of animation: the children more accurately categorized Animate (e.g., cow) exemplars than Inanimate ones (e.g., tractor). Additionally, the Animation variable interacted with Collaborator, such that in the presence of the real dog the impact of animation was significant, but this effect was not significant in the presence of the stuffed dog or human. This result indicates that the presence of the real dog served as a highly salient stimulus which encouraged the children to focus more of their attention on other animate objects in the list. This result provides additional evidence that the presence of a dog helps preschool children to restrict their attention to the demands of the task. This is a new and interesting finding that indicates that the presence of a real dog does have an impact on cognitive task performance.     

Methodological issues in studying the anxiety-reducing effects of animals: Reflections from a pediatric dental study

Abstract

This article reports observations made during a study investigating the role of a therapy dog in reducing anxiety in urban children visiting the dentist. The design and execution of the study were affected by methodological issues such as the reaction of urban children to the dog in the clinic, the tools used to measure anxiety in the children, the age and pet-ownership status of the children, and the personality of the therapy dog. Suggestions made for researchers designing similar studies include allowing children to become comfortable with the therapy dog before beginning formal data collection, working with younger children who have made fewer visits to the dentist, and using or developing more accurate tools for measuring behavioral and physiological anxiety.     

An experimental analysis of olfactory cues in child--dog interaction

Within the framework of rescarch on communication systems betweenthe child and his pet dog, an experimental situation was setup to study the characteristics and the functions of sniffingbehaviours: dogs living in a family with or without a childwere put in the presence of two dummies. These dummies weredressed in underclothes previously worn by a child known tothe dog, or by an unknown child, or clothes with no body odour.The dog’s behaviour was filmed for 5 min from the momentthe dog entered the experimental room. A statistical analysisof the results showed that the head, trunk, upper limbs andano-genital area were sniffed differently by the dogs accordingto the experimental situation. These results would suggest differentolfactory functions in the relational systems between humanbeings and dogs.     

Development of play behavior between potential guide dogs for the blind and human raisers

This study shows longitudinal development of human-dog interactions in a guide dog raising program. Social play interactions between potential guide dogs for the blind (puppies) and their adult female raisers (PWs) were videotaped at home during the period from two months to 11 or 12 months of the puppies' age. The puppies and PWs established close proximity relationships by two to three months of age. The older the puppies became, the shorter time the puppies and PWs spent in intensive fighting and chasing play. The older the puppies became, the longer the puppies and PWs spent in waiting, seeking and possessing together play which needed the puppies' self-control, concentration and ability to cooperate with the PWs. Whether or not these behavioral tendencies which the puppies showed were appropriate for guide dog candidates is also discussed.     

Children and their pet dogs : How they communicate

The research of ethologists has provided a better understanding of the mechanisms, role and development of communication behaviour between young children and their peers. However, little is known about the communication systems between children and their pets. A study of these relational systems would be needed to understand how the child interacts with his whole environment.The present study is based on the analysis of video tapes filmed during spontaneous interactions between children from 2 to 5 years of age with their pet dog (N = 45) in their home environment. Inventories were made of the child and dog behaviours during these interactions. The results have shown the different dog behaviours induced by the child and the different child behaviours induced by the dog. The links between these behaviours and the variables which characterize both partners (age, sex, etc.) were treated by factor analysis of correspondences. These data are discussed in relation to the behavioural inventories of children and dogs with their peers and conspecifics.     

The relationship of callosal anatomy to paw preference in dogs

Previous studies have described the paw preference and asymmetry in dog brains, based on experimental studies. The purpose of the present study is to investigate a possible association between callosal anatomy and paw preference in dogs. The midsagittal area of the dog corpus callosum was measured in its entirety and in six subdivisions in a sample of 21 brains obtained from 9 male and 12 female mongrel dogs which had paw preference testing. The present study showed significant paw differences in dog corpus callosum. A posterior segment of the callosum, the isthmus, was significantly larger in the right pawedness than the left.     

Impacts of Encouraging Dog Walking on Returns of Newly Adopted Dogs to a Shelter

This study involved examining the ability of a postadoption intervention to reduce returns of newly adopted dogs to shelters by encouraging physical activity between adopters and their dogs. Guardians in the intervention group received emails with dog behavior and human activity advice as well as invitations to join weekly dog walks. Both the intervention and control groups completed surveys regarding outdoor activity with their dogs, their dog-walking habits, and perceptions of their dogs’ behaviors. Adopter–dog pairs in the intervention group were not significantly more active than those in the control group, nor did they show a reduced incidence of returning their dogs. Guardians in both groups who reported higher obligation and self-efficacy in their dog walking were more active regardless of experimental condition; however, obligation, dog-walking self-efficacy, and perceptions about their dogs’ on-leash behaviors did not predict rates of return to the shelter. These findings add to the understanding of shelter dog re-relinquishment and the effective utilization of resources postadoption, and they indicate further research is needed to address the complexities of this newly forming human–dog relationship.     

A Longitudinal Study of Decision Making in the Process of Acquiring a Dog

To prevent potential problems in the relationship between people and their dogs, it is important to engage in a thoughtful decision-making process with regard to acquiring a dog. To map the most important elements in the decision-making process, a social cognitive model was applied using seven psychological constructs: perceived advantages of having a dog; perceived disadvantages; the social norm; self-efficacy; optimism; expected commitment; and the intention to acquire a dog. People who were planning to acquire a dog within one year were asked to fill in an online questionnaire and another one 14 months later. The social cognitive constructs were operationalized in the baseline questionnaire, and in the follow-up participants were asked to report whether they had actually acquired a dog during the 14-month interval. The sample (n?=?588) largely consisted of females (88%) and those who had a high level of education (64%). The mean age of the participants was 40.9 years. The data showed significant relations among the decision-making variables, and significant differences between demographic variables related to these. In univariate longitudinal analyses, several social cognitive variables significantly predicted acquiring a dog in the 14-month period. When intention to acquire a dog was entered into the multivariate model, it remained the only predictor (OR = 2.16, p?<?0.001); the model explained 33% of the variance in acquiring a dog. It was possible to assess the main constructs that play a role in decision making regarding acquiring a dog: Most baseline measures were related to actual later behavior, also when taking into account all changes in other internal and external factors that may have taken place. Insight into the decision-making process makes it possible to intervene in it for the good of people, dogs, and their relationships.     

Four-legged friend or foe? Dog walking displaces native birds from natural areas

Dog walking is among the world's most popular recreational activities, attracting millions of people to natural areas each year with diverse benefits to human and canine health. But conservation managers often ban dog walking from natural areas fearing that wildlife will see dogs as potential predators and abandon their natural habitats, resulting in outcry at the restricted access to public land. Arguments are passionate on both sides and debate has remained subjective and unresolved because experimental evidence of the ecological impacts of dog walking has been lacking. Here we show that dog walking in woodland leads to a 35% reduction in bird diversity and 41% reduction in abundance, both in areas where dog walking is common and where dogs are prohibited. These results argue against access by dog walkers to sensitive conservation areas.     

Dog Pups’ Attractiveness to Humans Peaks at Weaning Age

The domestic dog (Canis lupus familiaris) is characterized by greatly reduced parenting investment compared with the wild type wolf (C. l. lupus) from which it is descended. Unlike wolf pups, which are reared by both parents into their second year of life, dog pups are abandoned by their mother at weaning around eight weeks of age. This relatively small parental involvement may contribute to the high pup mortality observed in dogs not living as pets. We hypothesized that people would find dog pups most attractive around weaning age when conspecific parental care is significantly reduced and pup mortality rate is high. Younger and older pups would benefit less from human intervention because in the former case the mother is providing care, and in the latter their survival is already compromised. To test this hypothesis, 51 participants rated the attractiveness of 39 black and white headshot photographs presented on a computer screen of dog pups from three breeds (Jack Russell Terrier, Cane Corso, and White Shepherd), from birth to 7 months old. In line with our hypothesis, attractiveness of Cane Corsos peaked at 6.3 weeks of age; Jack Russell Terriers’ attractiveness peaked at 7.7 weeks; and White Shepherds were most attractive at 8.3 weeks. There were also differences in attractiveness between the breeds, with Cane Corsos rated less attractive than the other two breeds. If this attractiveness motivates humans to care for the dog pups and thereby improves pup survival, this could confer significant advantages to dogs, and may contribute to our understanding of the process of domestication.