Izz that looks the same as what my dogs had. I have fed same dog food last 6 months don't know how it could be a food allergy. Regardless if you can get your vet to give u prednisone and u can the Benadryl over the counter 2 in the morning 2 at night. Should do the trick.
Same here ive ha them on diamond for a bit. But ive notice the same thing on my other dog as well. His kennel partner. Im wondering what the hek it is. Ima try andget sone of that prednisone and change up the diet. I was also thinkin about putin some nu stock all over them and hopin it works that or some used motor oil