Hum well if a dog quits with me in the mountains that is one. And for Any reason, Gunshot, thunder storm, range bulls.....people yelling.....whatever.....They cannot ever ever quit.
Regroup, yes.....come at situation a different way, yes. But quit and sulk- No. A dog like that I might keep but will never be a first string dog. And chances are he might find himself placed into a situation that suits him better.
I have to trust the dog to do his/her work out of my sight, where there are no commands. Dog must be diplomatic or tough depending on situation without being told. Like, rousting out a bull in deep brush on a summer day. Or bringing new ewes and lambs off the hill. The dog must come from lines that have this in them.
Loyalty- Dog must stay with me. I cannot look around and find my dog is 1/4 mile away sniffing scat. Must want to partner up and stay with me. Without me doing anything.
Stays sound, tough feet, good bone.....general good health- STAMINA- Heat/Cold Tolerance.
Ok, now I got that out of my system. I learned this stuff the hard way in real life situations. (The fire) But Every dog has problems.....My Jake and Joe are top of the food chain grand in my work. But Jake can't tolerate cold as well. Joe you gotta watch with tiny lambs, as he can be overly 'pushy'
I like a good natured dog too, one that likes people and will work with anyone.