Approximately 60,000 dogs were part of research, education, or drug and other product safety testing in 2014, as reported to USDA by the . research facilities. Dogs account for less than one-quarter of 1 percent of the research animal total. Since 1979, when reliance was highest, the use of this model has been reduced 70 percent. Most vertebrate animals used in research are mice, rats and tiny fish, but a relatively small number of dogs still are needed because they are the most appropriate model, or the only one possible, to answer a research question. specifically for this purpose and typically are beagles or mongrels.
For the experiment, more than 500 people were shown two sets of photographs. One set showed pictures of real dog-owner pairs, while the other set had random pairings of people and dogs. The participants were randomly assigned to one of five different “masking” photo conditions, pictured below: no-mask (in which the human's and the dog's faces were unobstructed), eye-mask (the human's eyes were blacked out), mouth-mask (the human's mouth was blacked out), dog-eye-mask (the dog's eyes were blacked out), and eye-only (where just the eyes of the human and the dog could be seen).