I'm skeptical. I have my doubts that Haitian refugees are eating pet cats. I have somewhat less doubt they may be eating waterfowl from the parks.
If you're starving, you do what you gotta do.
However, if anyone tries to eat one of my cats, it's going to be a bad day for them— quite possibly their last day. Then, I'll feed my cats whatever is left of their earthly remains. Chopped fine, with gravy.
Yes, this means I value my cats' lives over the lives of people who would try to kill animals I am responsible for rather than just asking me for some food. I don't value the lives of thieves, and if what you're stealing (and killing) is one of my animals, then I value your life even less than that. So little an electron microscope wouldn't see any trace, if my valuation were a physical thing.