No matter how you look at it, abuse (towards animals, humans or nature) is wrong legally, morally, ethically etc. Simple as that. There are no studies that show anything good to come out of abuse, but there are millions of examples that show the negativity that comes out of it. Fact is, most animal abusers possess low IQ and they from places of poverty (poverty of knowledge, money, morals, ethics, laws, intelligence etc.). Another fact is, most animal abusers tend to have a knack for violence and they only use defenseless smaller life forms to practice these violent habits on.
“Only when we have become nonviolent towards all life will we have learned to live well with others.”
― César Chávez
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.