MY 10 month old lab has been itching and biting herself until she has bald spots on her legs and knees. Vet said food allergy, so I changed to a Salmon and peas brand. its been over 12 weeks and she is still biting. The only thing that stops her is Medrol, while on it she is fine. Noticed she gets some eye drainage, and sneezing too. Could this be season issues ?