What else should I be doing about my brother hitting his dog?

A few days ago I was at my dads for dinner. My brother, and sister were there. My sister brought along a girl that she was watching while her mother was on a trip. My brother has a pomeranian shih tzu. We have dinner at my dads often, and my brother always brings his dog, but I think his dog was on edge, because he didn't know the girl that my sister brought. Anyways, my sister walked by the dog, and it jumped up, and bit my sister on the leg. I only saw it at the corner of my eye, but my brother quickly dragged his dog torward him. The dog yelped in the process. It may have just scared him, or it may have hurt him. Then my brother smacked him. I told my brother in the past that I disagree with hitting a dog for any reason. We agreed to disagree, so I really doubt just talking to him would do anything. I ended up calling the police department and told them what happened. They said that it's not abuse, and to call them if I ever see my brother hit his dog with a closed hand. They said that they will put it in the record that someone reported it. I feel like it is abuse, and they are wrong. There is a humane society in my town. Maybe I should call them?

What else should I be doing about my brother hitting his dog?
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