I have a 5 month old pd that hasn't grown or gained weight since May. Also has lost all hair on her underside and muzzel. Feed her puppy kibble mixed with prosobee formula,sweet potato baby food,fresh corn,sweet potato and dandelion greens. She doesn't eat much and sleeps all the time. Had a skin test that ruled out any parasites. Sleeps a lot but when awake doesn't seem lethargic. She only weighs about 168 grams. Any suggestions?