I don't see where OP stats the owner of the dog is his friend. It sounds to me that the OP heard what his customer was going to do and stepped in to rescue the dog.
And obviously this statement is ridiculous. No better than the current owner of the dog.
Quoted from hawkmoon:I can't tell you how F....d up your friend is!!! You would do that to a helpless dog that called him a friend?? You Texas creeps love to play with guns,why don't you shoot your friend instead!! Asshole!!!