Because I was beaten, and neglected growing up. We had a family dog, I got angry one day because I was locked out from the house after school. I forgot my house key and was in elementary school. I started to hit my dog, Lucy out of frustration.
Because everyone in my family hit me. I saw the fear in her eyes and have never hit an animal and person since. It took a long, long time to get over that. I am at peace with this now, I can't deny it still hurts. When I hear OLD OLD folks call it discipline, I punch walls and tell them the next one will be in their face.