It's awful to do it to cats so I would assume it's equally horrible to do to any animal. I wouldn't declaw anything no matter what. I know you are just debating. I'm just saying that declawing a cat is the equivalent of chopping off the tips of your own fingers. It's not okay. So I think it's not okay for any animal.... dogs, cats, etc. Whatever. Just say no to declawing all together.
(For what it's worth, some cats have residual pain from declawing for the rest of their lives.)
Personally, I probably wouldn't dock a dogs tail, ears or remove their dewclaws either. Cody came with his tail docked and dewclaws removed so that's that. But if anyone had asked, I would have left it all intact for him. But that's just me. I do feel a little better about it since he clearly has no residual pain from either of those procedures.