EWO, who knows really. In Buck's case, he was 6 (I believe) when he beat Sandman. He won that in over 3 hours. It was his hardest match, I'm sure, and it was also when he was passed his prime. While I'm confident that Buck could've won more, at that age and all that mileage, what's the point? Sometimes the risk simply isn't worth the reward, especially when you have a dog like a Buck.

I can comment on one particular dog that stopped at 3 instead of going for more. Ch.Beetlejuice came south from Canada and beat McNasty for his championship. McNasty had beaten Juice's brother, in a show prior to Juice's, in close to three hours. So, after he lost to Juice, he contacted the Canadian again about Juice. The Canadian told him that if he wanted Juice again, he'd have to bring Stan the Man into Canada at 42 lbs, and they could do it. Afterall, Juice had come into the states, why not take Stan to Canada? McNasty declined the offer, and that's why Juice only stopped at 3. I'm sure if he would've won his 4th, he would go out for his 5th, but that's all water under the bridge at this point.