I think you first need to understand the difference between a 'service animal' and a 'therapy animal.' The difference is huge as is the price. Which is it you feel you should have? In many places therapy animals are considered no more than pets and do not qualify as 'service' animals for purposes of gaining access to public places or mandatory acceptance with regards to accommodations. Please research out which it is you want to get.

You need to check the laws in your area regarding the limitations placed upon a therapy dog before you make a decision.