Hi, I'm Dr. Peter. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
I am sorry to learn Cooper is having problems itching. My name is***** am a licensed veterinarian and I will be assisting you today. First I need to ask you a few questions so that I can be well informed and give you the best advice.
1- How long has he been on Royal Canine?
2- Is he currently on any medications?
3- Are there are any lesions of the skin?
4- Has your vet done a skin scraping?