I stepped on my dogs foot
Was it by accident that you stepped on your dog's feet?
Yes, I wasn't looking where I was going
It's understandable if it was a mistake. You should comfort your dog and give it a treat as an apology.
I was pissed that I stepped on the dog. I got mad and kicked it.
That doesn't make any sense. You stepped on the dog. Why would you get mad and hurt it more?