I have a datsun/long hair chihahau mix adopted from the pound. He HATES being combed. I have to wrestle him and hold his head under my one arm so he won't bite. He has lots of hair. I also have a recent White Eskimo Spitz that refuses to be combed as well.
What I have resorted to do to both is slowly introduce them to the brush. I got a brush that has soft bristles on one side and wire on the other. I use the soft bristle first and calm them down. Sometimes I make a chase game out of it by quickly brushing them when they run by. Slowly I have been able for them to be able to stand still more and comb.
I would also give the dog Brewer's yeast. It helps there coat and helps their skin. It is supposed to be good for flea prevention as well. I started the Eskimo Spitz on the tablets and his coat is looking much better. Avoid the brewer's yeast with garlic. Can get the tablet at Walmart near the dog shampoo or powder form at a GNC. Good luck!!! ( Plus you may want to shave this dog this summer if all else fails.)