I talked with the vet over the phone, when I got the results on the heartworm test, and she said that if it came down to it that they'd do the food allergy to see if he is allergic to chicken, etc. But I read some allergy behavior and he doesn't lick his paws like mad or any of that. But then again, I'm not a professional so who knows.
Sorry don't mean to be so down, just frustrated.