[Kathyy]

Well my rescued dogs' coats improved with a richer color and improved feel but nothing like what you are describing. You are going from good food to good food, my dogs went from a bad diet to a good one. What kind of dog? I know a stripped terrier retains more color than a clipped coat because undercoat is pale compared to the guard hairs. Puppy coat is often much paler than adult coat.

 

[Kathyy]

Is the hair much coarser than the old hair? Are they guard hairs or undercoat? I have no clue why but every once in a while my black spaniel mix's rear end feathers would go extremely coarse, like horsehair. Still black though.