Yes, animal abuse is wrong! I don't know why it even needs to be explained. Animals feel pain and suffer from cruelty just like people do. The difference is that they can't go and tell someone, ask for protection and help. If someone beats up a dog or a cat for their own amusement, they must be jailed, period.
Animals live as much as humans do, and hitting an animal is like domestic violence between humans. I don't get why people buy animals if all they are going to do is hurt them, it's a waste of money, and you wasted an opportunity to have a loyal new friend.