Emotional Support Dog

My son is special needs, The nerves on the left side of his brain did not develop which has caused learning disabilities,loss of hearing in his left ear and some emotional difficulties. His Dr. suggested he get an emotional support dog. He loves animals more than people. I think this is great step in the process of getting him the help he needs. This is his first year in middle school and this would help him a lot. The dog has to be hypoallergenic due to him and my other children's allergies, and those breeds are quite expensive so we are needing some help. Anything will help  ANYTHING.  We are not looking to be breeders we are looking for a dog to love and love us back. The funds we receive will not only help us purchase the dog but also getting he/she everything it needs..