[anonymous]

Are you talking about the skin turning pink as in inflamed, irritated? If so please consult a vet (in real life) one that actually examines your dogs, asap. Your dogs may be having an allergic reaction and may need medical attention right away.
Impossible for any vet wannabe to advise you over the internet.
Stop consulting Dr Google. You are wasting time. CALL THE VET!
Good luck.