my puppy, Lowla is starting to get these balding spots on the very top of her head and one on her back. From one angle you can't tell, but from another angle it's pretty obvious. She doesn't seem to scratch anymore than usual in those spots. The skin looks fine, no crusties or inflamation, her fur is just thinner there. She's on Natural Life Lamaderm Puppy and Royal Cainin Baby. She doesn't seem to have any reactions to them. She does have quite a few fleas, I haven't started her on something like K9 Advantix, just given her a flea bath a few weeks ago. Do puppy coats thin out before they get fuller? Or should I just take her to the vet and maybe he'll know what's up? She's about 14 weeks.