This is serious but I'm afraid to ever have kids because I get so angry at my dog that I want to beat her and I know kids are worse.
Why would you want to bear your dog?
I am frequently angry that she won't listen to me even though I think I am doing my best.
It is good that you recognize that you would be a bad parent but you should realize that you are a bad pet owner. Pets depend on people and should be treated kindly.
Bullshit. I sometimes kick her if she's annoying me.
Admitting to being angry enough to hurt your pet doesn't justify your actions. If you are worried it will translate to hurting kids you need to get help now and find a healthy outlet for your anger before you do something that can't be undone.