What are the common foods that cause dermatitis in dogs please?

I'am taking my dog to the vet tomorrow but just wondered if any one knew I know the vet may tell me tomorrow but I took my dog to the vets frequently for 2 years for a leg problem and the vet didn't even tell me about a supplement you can give a dog that may help which they even sold at the vets someone on... show more I'am taking my dog to the vet tomorrow but just wondered if any one knew I know the vet may tell me tomorrow but I took my dog to the vets frequently for 2 years for a leg problem and the vet didn't even tell me about a supplement you can give a dog that may help which they even sold at the vets someone on here told me about it and it has really helped sometimes vets just tell you the bare minimum and get you in and out as quick as they can thanks
7 answers 7