I stole a houndour because its owner was going to enter it in something called the death ring, that and it was also malnourished and had cloudy eyes

bills-pokedex:

Give yourself some credit, @marcusredleaf. You didn’t steal that houndour. You rescued it and, perhaps (and hopefully), introduced its trainer to a comfortable life with guaranteed shelters and meals within their nearest prison.

To be fair, Nurse Joys are, in general, rather terrifying if you cross them.