A hunter oriented culture would be unlikely to make a pet or companion out of a food animal. Must have been after agriculture started to “take root”.
A medieval horseman with a frog growing out of his forehead rode up to the local doctor and astrologer. The vet was already considering recommending a good bleeding as the cure.
"How did this start?"
The frog replied, "it started as a wart on my ass."
Theres no evidence that the early animal domesticates (dogs , horses, pigs) were pets. The earliest horse culture was nomadic (and stayed that way long after taming horses).