In general, the death rate of wild dogs/abandoned dogs is very high, especially as puppies. Dogs evolved to have a willingness to essentially eat almost anythin

In general, the death rate of wild dogs/abandoned dogs is very high, especially as puppies. Dogs evolved to have a willingness to essentially eat almost anything. They are obsessed with food sources out of necessity of survival. Wild dogs will eat basically anything they think is edible and keep eating it if they find that it is edible. Abandoned dogs are less conditioned to eat just anything, so they are much less able to survive in the wild (that's dependant on age of abandonment, though). By evolving to also be extremely open to human partnership, they have much longer lives when living with humans because humans are extremely consistent and persistent food sources. Their "loyalty" and "love" is, instinctually, to our supply of food.