We have a 6 wk old american pit . She was eating and drinking fine on Saturday when we got her. She was also playing,barking,growling and now nothing.She has lost weight and will not eat or drink and is weak.I did take her to the vet yesterday and she was test for Parvo which was negative.They gave her dewormer and are testing poop to see if there are worms.I have been forcing her to drink and eat puppy food because she keeps throwing up puppy milk. Is there anything else I need to do to help my puppy