did you pet it with out asking? wjat kind of therapy dog because it could also be trained to protect. you really arent suppose to pet them

There is a huge difference between therapy dogs and service dogs: therapy dogs are companion animals to deal with high stress and anxiety, whereas service dogs are highly trained to actively help less able individuals navigate their daily life. Therapy dogs are not specially trained, but are generally selected for personality, since they need to be a comforting personality for someone who is likely to be the less emotionally stable part of the pair. For people who need therapy animals to function, they can be a godsend: some people who cannot do their daily routine without a friend or relative with them find they can live normally with one of these animals. Unfortunately, that means some people DO game the system, but frankly the people who need them the most will also be among the ones least equipped to deal with the objection of a store or restaurant.

Did you antagonize it?

Make sure you tell whoever is in charge, just so it doesn't happen again to someone else. It definitly sucks for you, though. Get better OP. :)

OP here! Just to clarify, I didn't intentionally antagonize him and he didn't intentionally bite me. I was playing with my neighbor's retired therapy dog, and whilst trying to pull a toy from his mouth, he chomped down on my finger. It was most definitely an accident, and though it hurt like hell, we have forgiven each other and we're friends again. And I've learned my lesson about watching my fingers while playing with a dog.

I've had that happen before. I screamed and my dog at the time tried comforting by licking the finger she chomped on earlier

So, how's the dog's therapy going?