I have a Great Dane/ Mastiff pup who is 8 1/2 months old. Whenever he gets mad or excited, his nose and whites of his eyes turn pinkish red. The part of his nose that turns red is the top of his snout, which has white hair. I have read that it could be a food allergy, dish allergy or its just turning colors. I don't understand how an allergy can only flare up if the dog is excited.
I am feeding IAMS puppy. I am wondering if I should switch foods.
The color stays pink for about 10 mins or so and then goes back to white.