Many racing dogs especially from FL have hookworm. The worms are immune to standard meds. My vet recommended Safe—Guard Dewormer for goats and they went away. You give 1 tablespoon with food for 5 days. Also my GH has pink skin and she recommended Omega Fish Oil for dogs 1 gel tab 2X per day. This was from Dr. Barker (no pun intended) head Vet of Dairyland Racing track in WI.