My Rotti Nico had these when he was 2. I rushed into the vet nervous snd he said "Has this dog been under any stress lately?" and here it was acne brought on by stress! Who would think dogs can have a break out!
We had just left him with the family (house in which he grew up in) while we went on our honeymoon! We NEVER left Nico again!......and the acne never came back!