I stepped on my dogs tail and played it off like it didn't happen
Why did you step on your dog's tail?
I wanted to hurt the dog.
You should never hurt your dog on purpose like that. We should always strive to take care of our pets the best that we can.
I just wanted to scare the dog, it's fine.
It is not fine to scare the dog in that way. You could cause harm to your pet by stepping on its tail.