my wife and i got to boxer pups in augest from two different breeders, the female boxer has not eaten in three days and drank anything in two days. she does get up and move, but not her normal self. i dont think its parvo cause the other dog has nothing wrong with him. did call a vet and he said it might be an upset stomach. but if so how long will it last since she will eat or drink again? we dont have the money to take her to a vet at this time. what can i do to try to get her to eat and drink?