I read recently (in the journal "Science" I believe) about another interesting case. Seems a judge had to decide whether to euthanize several pet cats from one neighborhood They had attacked, bitten, scratched, and severely injured a postal carrier, apparently without provocation. There were initially no indications of disease, such as rabies, or other causes for their behavior
On investigation by animal control, however, it was determined that the cats' behavior was possibly linked to recent changes to their diets. They had all been fed a locally-produced cat food since its introduction a few weeks earlier. While the catfood seemed no more or less palatable than others, genetic inspection indicated the presence of human DNA. A search of the producing firm's facility revealed a stash of gold fillings, jewelry, and odd bits of clothing.

It took several weeks to flesh out the story (so to speak). It seems the cat food company was purchasing unembalmed cadavers from a local cash-strapped family mortuary, grinding them up, and mixing them with ground entrails and such from more acceptable sources to create their product. The cats became quite fond of the flavor, and decided to try to devour anything that had a similar smell. The poor postal worker was the culmination of their gustatory experimentation.

The judge determined that, while the kitties were not responsible for their actions, they were still a menace to society. Not being much of a cat lover, he had them dispatched and fed to the guard dogs at the state prison. That eventually also took care of a problem with unauthorized pet cats at that facility.