Not long enough? What about people who shoot birds for their feathers. Should I go to prison for three years for killing a bird for the heck of it? Maybe you should stop eating meat...
Do you beat the bird with you fist for pissing on your floor?
This is about an act of violence to control, not hunting or utilizing an animal for its feather or meat.
There is a difference.
We don't beat the steer to death and we don't torture the chickens. Beating a puppy to death is a senseless act of cruelty.