But for most of human history, dogs were working animals, too. The only difference is that they are (usually) too big to be allowed to gather their own food. That would be dangerous (and inconvenient, considering that they are pack hunters). That is the difference: practicality, not biology.
Dogs do go feral. In an area not very far from here there has been a pack of feral dogs, descended from escaped domestic dogs, roaming the mountains for at least 30 years. They have been spotted every few years (it is a very remote place and rough country) but their fate is uncertain now that the wolves have returned. And Dingos are of course another example of formerly-domesticated dogs returning to the wild.
Another interesting example is the domestic ferret. Evidence indicates that they have been domesticated for approximately as long as dogs and cats. And again, for most of human history they were working animals: they were (and still are) used to hunt small game. Not only that, but prior to WWII, right here in the United States, ferrets were also popular farm animals, used for keeping rats, mice, etc. out of the granaries just like cats.
But unlike both dogs and cats, and except in New Zealand (which presented very specific and unusual conditions), ferrets don't go feral. They just don't. It doesn't happen.
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