Lice are highly 'host specific', that is ... It may also be that the nits you see in your dog's hair are flea eggs or larvae. Dogs develop allergies because of various causes.

Best shampoo Adams Plus Flea and Tick Shampoo is our top pick for the best flea and tick shampoos for dogs. In addition to killing fleas, flea eggs and larvae, ticks, and lice for up to 28 days ...