I Hate Animal Cruelty [I Am Against Animal Cruelty]

I felt such an angriness.
Saw that, let's called him..., man, walking with a little kid...I guess he's around 5. The kid was taking a puppy with a leash.

The thing is ...the puppy wanted to run towards my doggies and he pulled out the leash and made the kid fell down.

The man hit the puppy. I asked him for not hitting him. The damn dumbass didn't find another reply that the following: I bought this dog and I do whatever I want.

I told him that the puppy wasn't a toy for the kid. He was a noone. I told him that he hasn't got shame ...that a kid shouldn't take the leash being so little until the puppy learns.

He replied that if he wanted to kill the puppy, he would do it.

My god! That made me sick. I told him that I would demand him. That this wasn't the way to have a dog.

I'm aware that I would have faced to the situation in a different way. Perhaps, making him understand why a dog shouldn't be hit. It's not the dog's blame to follow his instincts. But, on the other way, this dumbass was old enough to know how to behave.

I already had this other approach with a dog owner that I knew because he sometimes corrected his dog by kicking him and each advise or explanation for his dog's behaviours were followed by a ...yes, but...

What would you have done?