Dave, your dog is fat because it is chained and never gets any exercise (or fun). Nice life you're bragging about!
Did you tell your vet your dog is chained? Did the vet say nothing? Nice vet.
So...you fattened up your dog and it is no longer afraid of being beaten....but it is STILL ABUSED!...only passively.
A dog would rather be beaten and starved than isolated...you are not the nice guy you think you are.