I think a prisoner trained my dog to give head (NSFW)

[MicroBob]

holy crap.

If you can tolerate the awkwardness and embarassment of the situation I think reporting it to the humane society that this guy or entire prison needs to be kept away from dogs might be a good idea.

They could even look into it a bit further for you by interviewing some of the other families with whom dogs have been placed.