I don't think it's a good idea either as it is a huge risk. If the dog broke a healthy persons bones then what will he/she do if she bit an elderly persons hand, who possible had arthritis or something else similar. The dog could knock down a person in a wheelchair, or someone who had a walker. I know Sassy used to be afraid of wheelchairs and canes when we took Sassy to my grandmas nursing home. She wasn't a therapy dog, but any friendly loving dog was allowed in to visit the people. I think the fact that she wants to do this for the dogs reputation is great but if that dog mauled her hand "accidently" it's should not be allowed. I cannot understand why a Therapy dog training center would allow a dog with ANY agressive history to become a certified therapy dog.