is there a way to know 100%?
sure there is people who will take any challenge with any dog they have open as long the weight is ok. you don't know any of these?
you dont need to be overconfident for that but if you feel you're going to lose 100%, your dog must be very average(or below) quality and wouldn't be worth to feed in the first place.
edit: sorry i didnt get the joke then, lol.