I don't think it is a big deal one way or the other if you get a dog from a therapist or not - as long as you know what having a dog entails, it is a breed your lifestyle is compatible with and you understand a pet is a life time commitment. So I would be less concerned about where you get the pet from than making sure you are really ready and wanting a pet and not just some thing from a therapist. I am more worried about the pet. Although responsible breeders will take their dogs back if something does not work out with the buyer (this does not include returning money) rather than have their dogs end up in shelters.