I'm not saying as a rule, or building a kennel around the two 10" dogs, what i am trying to say is there is enough shite out there being bred just for the sake of a quick quid, why not at least improve your chances by breeding two PROVEN 10" dogs together if the chance arises, instead of just grabbing a dog and breeding it to your bitch just because he's got a bit of leg on him, granted your point that the smaller ones will find it harder going against a big dog fox or angry vixen but why not go with the worker to worker regardless of size.