Took puppy (3 mo) to vet about 1 week ago for something that bit him.. got all better then all of a sudden he just lies around hasn't eatten for about 2 days barely drinks water... has dry heaves and seems to be losing weight... have offered wet food.. because what dog won't turn that down... didnt work... any help will greatly be appreciated... im scared he's not going to make it until I can get him to vet on mon morn