Hi can some one please help me I hv a pitbull puppy a nice grey and white he use to eat the purina puppy chow but for some strange reason he don't want it no more I took him to the vet but he still isn't eating please help me please he is losing his weight drastic he is 3 months by the way

Take him to another vet.

Puppies that don't want to eat is very alarming.

Agree, you need to see another vet now. Is he drinking water normally?

I agree with seeing another Vet. Have you also tried any other brand of puppy food? Sometimes a puppy, and full grown dog, just simply doesn't want a particular food, and a change might be needed. Good luck with the 3 months old puppy. I had a puppy who liked a puppy food, then in about 2 months, it wanted something else. It started eating when I changed to a different food.

Did the Vet give you any instructions or recommend a change in diet? I see where you took him in but I don't see what the Vet said. It could be as simple as changing the flavor of the food, or it could be more serious.