Can anyone point me in right direction

I'm trying to gather information on registering my dogs as emotional support dogs. I have always had extremely bad depression and anxiety. I have been off my medicine for awhile now while TTC and learning to cope with other methods instead of meds. All the information I find on Google is leading me in different directions and giving me information that doesn't match what other things say so I'm getting kind of frustrated. I live in the state of Iowa if that makes any difference. Any help or info anyone can give me would be sooooo appreciated please!