bald spots

My dog is always biting his tail, tearing out the fur. He also has a bald spot on his hip. please help me.

My dog is always biting his tail, tearing out the fur. He also has a bald spot on his hip. please help me.

Those are prime spots for fleas !
Check for fleas or flea residue.

I find the best product on the market right now to be Advantage, you can get that only at a vet's office.