Luo1304
Quick question: What about your dog makes his skin "tough?" I mean.....it's a dog. Even in beast/man clone version, there's nothing about it that would make it resistant to that much lighting. Oh, and I know I've asked this before (just don't want to sift through pages of stuff to find the answer), but is it just the clan that makes your bones "as hard as diamond" or is there a special jutsu or...."
Just a special transformation/ability it has. Yajuu has two forms, his small and fast kind, and his big and tough/strong kind. He can switch between them but it takes a good bit of time to do. He can't constantly swap back and forth either.
For the bones, it's rank really. I think they're only about as strong as iron at genin. Then steel at later ranks, and then finally diamond/tougher than diamond at Sannin. That aside though, Fenrir has also used a special jutsu (complete bone armor) to further increase his defense.