An ulcer is when the edge of a cat’s mouth looks like an ulcer. The dog should be fed a light diet with a liquid food and vitamin supplements, especially vitamin B. For care, clean the ulcerated area with saline or double oxidation, then apply medication for the ulcer and put a collar on it afterwards to avoid the cat touching it. If it is more serious, take it to hospital for examination and treatment. Pay attention to nutritional balance in the usual feeding of compost.
