The mass was benign. He didn't HAVE to do a damn thing. You don't just go hacking off growths willy nilly because you don't have the cash to take the dog in. What if the mass had been very vascular and the dog bled to death? What if he had hacked into a mast cell and made the situation even worse from the mass histamine release? There is a lot more to removing growths than just cutting them off and stopping the bleeding. With any luck, at least the guy will be smart enough to not do it again. Or perhaps he will be barred from owning more pets. Regardless of cruelty, the guy is certainly guilty of idiocy.