I was going off your last line where it says "But an already dead dog or cat,heaven forbid!!!"
But I do agree with what you have said,nobody thinks of what we eat when talk about feeding snakes this type of prey item. It is society that has done that to us. The animals we eat had a life too but since we were rasied that are nothing just our food we do not care. Where cats and dogs are our pets not food.
I don't even think vegetarians can say anything cause to have fields to grow veggies and fruits farmers would have to cut down more forest and trees and destroy more ecosystems which in turn destroys the environment.
Just like Mousakilla said..our bodies get eaten by worms,maggots and anything else lying in the dirt after we are gone and buried. so in the end it is one vicious circle of life.