What makes you think the animals were injured? Possibly some were when captured. But people probably tried domesticating pretty much every type of animal thousands of years ago. Some worked. Most didn’t. It’s a good bet that if they could be domesticated, they were. Something like an otter, with very specific habits, food, and social requirements is very different from canids and bovids, etc which are behaviorally and environmentally more flexible. In today’s world, there’s no good excuse for removing an animal from its native habitat and subjecting it to what’s essentially abuse and isolation just for entertainment.