1958 was a bad year to be a dog, if you were unfortunate to be one of the 400,000 sacrificed annually in laboratories in the guise of medical science. Some experiments may have been justified in genuine pharmaceutical research but many were futile exercises performed by inexperienced medical and dental students as basic lessons in drug reactions that could more easily have been learned from text books rather than vivisection.
Many of the dogs were poor abandoned, homeless animals but some were obviously pets judging from the way they sat up and begged for food and water. They got neither. Unscrupulous individuals caught or kidnapped these animal for sale ($15) to schools in the dog-lab trade. Students were forced to execute them or risk expulsion. The flashbacks and guilt remains years later.
I was reprimanded for giving water to a dehydrated hound and ordered to cease since "it was going to be killed anyway." Such cruelty was difficult to comprehend from instructors who were supposedly training us to be caring providers of health care. Hopefully, no humans were ever in their care.
Professional schools no longer force students to participate in rampant, senseless animal experiments.