I agree it is fun to have early starters, but I wouldn't call a dog that hasn't started by 2 "cold" ... just unstarted.
Chinaman, Dibo, etc., etc. weren't started by 2 (3, 4, 5 ...) but they weren't cold either.
Actually, it is a biological fact in wolves that, while they may reach SEXUAL maturity at 13 months, they do not reach SOCIAL maturity until 3-5 years of ageIn other words, just because they have semen and may hike their leg doesn't mean they're ready to challenge for the pack leader until they're much older.
An intelligent dogman will take this biological fact to heart and, while some of his young dogs may "start" young, this does NOT mean they're ready to get into deep water yet and/or go all the way against a mature adult
Jack
PS: Another liability with doing dogs too young, aside from ruining them, is their teeth aren't fully set in their jaws yet. I can think of a dog named Green Eyes who was ruined by his owner not paying attention to this biological fact either![]()