I am fostering a 7 month old Maltese puppy who just got neutered last Friday (4 days ago). He seems to be in great discomfort - he will scream and scoot his bottom on the ground, or scream and suddenly turn around and lick himself. This happens randomly and frequently. The incision looks clean. When he stands, he keeps his back hunched. Yesterday I started giving him buffered dog aspiring (1/4 tablet every 12 hours), but I don't see much improvement. Should I be worried? I called the vet who neutered him yesterday, and he didn't seem too concerned. It is hard for me to see him in such pain.