There's now law on when a dog is entered I base it on the dog itself an it's maturity if a dogs ready to go it's ready some don't nature till 2 years old some 6 months old. Each to there own mate everybody does things different that's the beauty of terrier work. But it proved to work because the dogs proved itself for 10 years and learnt the tricks of the trade early, an was schooled to [BANNED TEXT] he loves he has been an excellent worker for me threw the years an I wudnt change a thing about him. Maybe it's the bull in him but his sons exactly the same am I don't the same thing with him an