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There is a mismatch between the widespread belief that human-animal interaction (HAI) interventions work and the empirical evidence supporting the effects of these interventions. Research on some types of HAI interventions has advanced in terms of both quality and quantity in recent years, but not all areas of HAI research have seen this type of improvement. In this chapter, we examine some problems with existing research on the use of HAI in therapeutic situations including basic design problems, questions about whether the animals really constitute the active ingredient(s) in HAI interventions, low statistical power and variability in procedures, researcher bias, the file drawer problem, and spinning research results. We conclude by highlighting key steps researchers can take to continue to improve the evidence base for HAI interventions.

Attachments between non-human animals of different species are surprisingly common in situations involving human agency (e.g., homes, zoos, and wildlife parks). However, cross-species animal friendships analogous to pet-keeping by humans are at least rare and possibly non-existent in nature. Why has pet-keeping evolved only in Homo sapiens? I review theories that explain pet-keeping either as an adaptation or an evolutionary by-product. I suggest that these explanations cannot account for the wide variation in the distribution and forms of pet-keeping across human societies and over historical time. Using fluctuations in the popularity of dog breeds in the United States, I show how shifts in choices of pets follow the rapid changes in preferences that characterize fashion cycles. I argue that while humans possess some innate traits that facilitate attachment to members of other species (e.g., parental urges, attraction to creatures with infantile features), pet-keeping is largely a product of social learning and imitation-based cultural evolution.

Because of extensive media coverage, it is now widely believed that pets enhance their owners’ health, sense of psychological well-being, and longevity. But while some researchers have reported that positive effects accrue from interacting with animals, others have found that the health and happiness of pet owners is no better, and in some cases worse, than that of non–pet owners. I discuss some reasons why studies of the effects of pets on people have produced conflicting results, and I argue that the existence of a generalized “pet effect” on human mental and physical health is at present not a fact but an unsubstantiated hypothesis.

Individual and litter differences in the number of attacks directed by Mexican garter snakes (Thamnophis melanogaster) at a threatening stimulus were studied over the first year of life. Newborn snakes born to wildcaught females from the same population were tested the day after they were born and at 7, 16, 31, and 54 weeks of age on reactivity to a potent nonmoving and moving stimulus (a human finger). There were significant individual and interlitter differences in number of strikes directed at both stimuli but no significant effect of sex. Intercorrelations among the strike scores of individuals across test days averaged .54 for the nonmoving stimulus presentations and .63 for trials with the moving stimulus. Strike scores to the moving and nonmoving stimuli were significantly correlated at each age, however, attack responses to the moving stimulus declined over the year while those to the nonmoving stimulus remained constant. Measures of concordance showed that both individual strike scores and litter means were highly consistent, whereas consistency within litters was reduced. The results indicate that litter and individual differences among newborn snakes in the tendency to engage in antipredator behavior (“defensive temperament”) remain relatively stable from the first day after birth throughout the first year of life.

Almost by definition, “popular culture” reflects the effects of most people imitating those around them. At the same time, trends and fashions are constantly changing, with future outcomes potentially irrational and nearly impossible to predict. A simple null model, which captures these seemingly conflicting tendencies of conformity and change, involves the random copying of cultural variants between individuals, with occasional innovation. Here, we show that the random-copying model predicts a continual flux of initially obscure new ideas (analogous to mutations) becoming highly popular by chance alone, such that the turnover rate on a list of most popular variants depends on the list size and the amount of innovation but not on population size. We also present evidence for remarkably regular turnover on “pop charts”—including the most popular music, first names, and dog breeds in 20th-century United States—which fits this expectation. By predicting parametric effects on the turnover of popular fashion, the random-copying model provides an additional means of characterizing collective copying behavior in culture evolution.

We evaluated the reliability of peer review ratings of 218 proposals that were submitted for presentation at the 2004 meeting of the International Association of Human–Animal Interaction Organizations (IAHAIO). Each proposal was evaluated on four dimensions by different sets of three raters who were blind to the identity of the authors. Single measure intraclass correlations between the evaluations of raters indicated that the reliabilities of judgments were poor for abstracts submitted as research presentations and as descriptions of applied human–animal programs, and fair for abstracts submitted as critical reviews. Reliability of the selection system was considerably improved by averaging the scores of the three raters and using the combined scores to make accept/reject decisions. We suggest modifications to the review process that may enhance the reliability of the selection process for proposals submitted for meetings and for journal submissions in anthrozoology.

Mail-in surveys were distributed to animal activists attending the 1996 March for the Animals. Age and genderdemographic characteristics of the 209 activists who participated in the study were similar to those of the 1990 March for the Animals demonstrators. Most goals of the animal rights movement were judged to be moderately to critically important, although beliefs about their chances of being realized varied considerably. Movement tactics judged to be least effective included the liberation of laboratory animals and the harassment of researchers. Education was seen as being a particularly important instrument of future social change. Demonstrators' scores on the Life Orientation Test - a measure of dispositional optimism - were significantly greater than scores of comparison groups of college students and of patients awaiting coronary bypass surgery. There was a significant positive relationship between levels of optimism and activists' perceptions of the achievement of movement objectives.

The authors examined the relationship between personality and attitudes toward the treatment of animals by administering the Sixteen Personality Factor Inventory and the Animal Attitudes Scale to 99 college students. The personality scales were only weakly related to attitudes about animal welfare issues. Two personality factors, sensitivity and imaginativeness, were significantly correlated with attitudes towards animals. Gender and sensitivity explained 25% of the variance in attitudes, with most of the variance accounted for by gender.

We examined the relationship between personal moral philosophy, gender, and judgments of the effectiveness of materials designed by advocacy groups to sway public opinion about biomedical research using nonhuman animals. Twenty-six male and 74 female undergraduates evaluated 16 advertisements or brochures developed by groups which either supported or opposed animal research. The subjects also completed the Ethics Position Questionnaire (EPQ) and were offered the opportunity to sign postcards urging their congressperson to either support or eliminate federal funding of animal research. Females perceived the anti-animal research materials to be more effective than did the males, a difference that was not found in the case of the pro-animal research materials. The idealism dimension of the EPQ and gender accounted for a significant portion of the variation in judgments of the effectiveness of the anti-animal research materials but not the pro-animal research materials. The pattern of postcard signing was predicted by the subjects' evaluations of the stimulus materials but not gender or the EPQ variables.

1 used a qualitative research approach to investigate psychological aspects of involvement in the animal rights movement. Interviews were conducted with 23 rank-and-file activists, focusing on cognitive and emotional aspects of involvement with the movement, concomitant lifestyle changes, effects on interpersonal relations, and the happiness and well-being of the participants. Three main themes emerged from these interviews. First, there was a surprising degree of diversity in attitudes and beliavior of the activists. Second, animal rights activism usually entailed major changes in lifestyle: almost all interviewees strove to achieve consistency between their ideals and their actions. Third, there were several parallel.^ between an involvement with the animal rights movement and religious conversion. The potential for increased communication between the animal protection and scientific communities is discussed. The animal rights movement has been spectacularly successful at drawing public attention to the ethical issues involved in our relationships with other species. Animal protection organizations have proliferated in number, membership, and influence since the publication of Peter Singer's book .Animal Liber

In two studies, we used the Ethics Position Questionnaire (EPQ) to investigate the relationship between individual differences in moral philosophy, involvement in the animal rights movement, and attitudes toward the treatment of animals. In the first, 600 animal rights activists attending a national demonstration and 266 nonactivist college students were given the EPQ. Analysis of the returns from 157 activists and 198 students indicated that the activists were more likely than the students to hold an "absolutist" moral orientation (high idealism, low relativism). In the second study, 169 students were given the EPQ with a scale designed to measure attitudes toward the treatment of animals. Multiple regression showed that gender and the EPQ dimension of idealism were related to attitudes toward animal use.

This paper characterizes the portrayal of animals and human-animal relations in one genre of American popular culture—the “supermarket” tabloid press. A total of 789 animal-related stories and photographs in 82 issues of four tabloid magazines were analyzed according to theme. The items fell into nine categories in which animals were portrayed as objects of affection, saviors, threats, victims, things to be used, sex objects, imaginary and mythological beings, surrogate humans, and objects of wonder. It is argued that these themes represent archetypes reflecting the roles that animals have had in human cultural and psychological life since the historical origins of our species.

People who work in biomedical and behavioral research settings sometimes form strong relationships with individual laboratory animals. Ethnographic studies indicate that it is common for these individuals to transform some animals from experimental subject to pet. Although theories of ethics that emphasize impartiality and justice have little to say about the moral implications of human-research animal bonds, caring-based ethical systems acknowledge the moral consequences and resulting psychological burdens of these relationships. Typically, albeit not always, animal care staff are more likely than researchers to experience the moral ambivalence associated with human-laboratory animal bonds. These bonds can result in conflict between technicians and investigators. Several ways that research institutions can help individuals cope with the ethical consequences of relationships with research animals include supporting the development of human-animal relationships in laboratories, giving animal care personnel an ethical voice through involvement in the institutional animal care and use committee decision process, publicly acknowledging the emotional and moral costs of human-laboratory animal relationships, and educating animal care staff about the purpose and possible benefits of research projects.

Few subjects covered in psychology courses arouse as much intense feeling as the issue of homosexuality. Students in three different undergraduate courses were asked to submit their questions about homosexuality prior to a panel discussion presented by representatives of a local gay rights organization. A total of 280 questions were collected. They fell into 13 categories, shedding light on the primary questions and concerns students have about this important issue.

Interviews were conducted with 24 graduating veterinary students to examine (a) changes in their attitudes toward animals; (b) the types of experiences and procedures that they found personally distressing; (c) their perceptions of the most important ethical issues that they will face in private practice; and (d) their responses to euthanizing animals. Students' responses differed considerably. For example, about half of the students claimed that they were not affected by euthanasia, but another 25% still were struggling with this aspect of their professional role. Rationalization was a common mechanism by which the students attempted to deal with stressful experiences. It is argued that the moral dilemmas faced by veterinary students mirror the ethical ambiguities inherent in human-animal relationships.

It would be difficult to overestimate the significance of animals in the social and psychological life of our species. Images of animals are everywhere: in our language, religions, dreams, television programs, and folklore. The feelings that we exhibit toward our fellow creatures are intense, complex, and paradoxical. Responses to animals range from the disgust we feel when confronted with a bloated tick to the reverence for animals as deities in so-called primitive cultures; from the love of a child for a pet bunny to the paralyzing fear of phobic experiences when confronted by a harmless spider.In recent years there has been increasing interest in human-animal relationships by investigators from a variety of disciplines. We will not attempt a synthesis of the growing literature on attitudes toward animals, but will follow a different course. For the past decade we have been exploring the diversity and origins of human-animal relationships, and our research has taken us into some rather odd place...

We investigate the relationship between characteristics of dog breeds and their popularity between years 1926 and 2005. We consider breed health, longevity, and behavioral qualities such as aggressiveness, trainability, and fearfulness. We show that a breed's overall popularity, fluctuations in popularity, and rates of increase and decrease around popularity peaks show typically no correlation with these breed characteristics. One exception is the finding that more popular breeds tend to suffer from more inherited disorders. Our results support the hypothesis that dog breed popularity has been primarily determined by fashion rather than function.