Animal - I have a 7 month old Raccoon and he has diarrhea. Please help?

You do realise that it is illegal to keep a raccoon as a pet unless bought from a licensed breeder AND after obtaining a special permit.

If you have then I apologize and my best advice to you would be to contact your local vet, raccoons are considered extreme pets and have very specific dietary and environmental requirements, only a vet can give you the best advice.