Hello, for the longest time [6 years or so that I have had him] my dog suffers from dandruff. Clean otherwise no issues I give him occasional baths but can't seem to keep the dandruff away. It's not really and issue for me, but I imagine it is extra itchy for him, and discouraging from strangers wanting to pet him. Also he has a bald spot that shows up on his tail on and off. Not sure what it is, any suggestions?