Should I confront this guy for slapping his dog?

[Hotzone417]

I work for a commercial cleaning company. We clean office buildings. There is this guy who keeps his dog in his office with him. I don't know his name but we say hi to eacthother. Anyways, when I went into his office to empty his trash, his dog started barking. He was like no! Then slapped her on the side. Not enough to hurt her but it made a slap sound. I didn't say anything and I feel kinda bad. Should I say something to him now?

Updates

+1 y

I'm pretty sure its a puppy.

[TommyMountainFigure]

No. It won't stop him from hitting her again. Would you say the dog looked mistreated other than what you saw? If so, report him! Otherwise there isn't much you can do.