For us it depends on the dog. Like our cur pups all usually start in the woods by 6, 7, or 8 months. I heard that hounds mature later but I dont have much experience with them. Only the one hound cross and he started at closer to a year.
same here, I have started pups as young as 6 months and as later as a year, just depends on the individual pup..... if they can keep up with the big dogs I tote em.