I understand what you mean as well.

I know of dogs that would take a killing ... so long as they can at least get their own holds and "bite back" ... but that same dog quit on all fours, without much damage at all, because it couldn't take being held out by the ear to where it could never get a single hold and, ultimately, he ran out of gas. So different dogs have different breaking points ...

I guess this just goes to show why each case is unique, and (as such) must be looked at individually

Cheers,

Jack