I want to beat my dog to relieve stress
Why do you want to beat your dog?
I feel so high strung and the dog can't fight back.
There is never a reason to hurt a defenseless animal. Your dog looks to you for protection and a good life, continuing to abuse it will not only hurt him irreparably but will end up with you in jail. Find a more legal route to get your frustration out, potentially through a gym.
I'm a dog lover who can't do anything anymore.
Can you really say you love your dog when you beat it? Unlikely. Please seek therapy beofre you strike your pet.