As far as my pets, if one gets sick I treat it if I think it can make it, if it doesn't seem like he'll survive I'll humanely euthanize, sometimes I'll feed one deceased pet to another if it's safe, kinda like a burial at sea. On the people in Asia eating pets: many of the animals in eaten in Asia cause health problems particularly bats, primates, reptiles and predatory animals of many species, if u had a bunch of islands where each was given different meats and no aces to medical care u will notice a major difference in lifespan something like this: reptile diet/ people die in teens to early twenties.
Bird diet/ people live approx 50 60 years.
Fish diet/ people die in twenties to late thirties.
Antelope and deer diet/ people die in 50 65 years.
Predatory mammal diet people live 30 40 years