Does Humphrey have any problems with his "pink" nose? I had a pitbull mix that had a black nose that turned pink and would blister, she was diagnosed with discoid lupus of the nose and we had to put sun block on her nose if she was going to spend any time out in the sun and she also took rounds of steroids and other meds as needed.
Our vet did advise us to put sun block on Humphrey but he stays in the house and we watch our dog park hours. No problems yet. We did adopt him through a rescue so I am sure there may be a few surprises along the way. However he is the happiest and silliest little dog and we couldn't love him more.