I do exactly what MRL suggested - I have an invisible fence, but I don't put the collar on Remi, he's 5 months old. What I do is put him on a 20 ft. line when we go out. At first I held it, and whenever he got to the edges of the yard, I'd stop so he couldn't continue. Plus he learned from my other dogs. Now I drop the line, so I can easily grab it if he ran off, but so far he has stayed within the yard and hasn't once tried to leave, so he is learning.
But I break it up - sometimes we go out on a 4 ft. lead and I have him casually heel. And only when I say "break" does he know he can start sniffing around and that kind of stuff, though. So he knows by now the difference in leash and the heel/break commands, so he isn't confused - long black leash means playing and running, brown leather short leash means walking next to mom.
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