I like to wait until my pups are 7-8 months old before starting FF.
It gives them a chance to be a puppy for a while and assures that ALL of their adult teeth are in.
By 8 months old their OB should be ROCK SOLID if you're doing your part.
Like I've said many times,,, You can't over train OB. If your Dawgs OB is solid, FF will go much smoother for you and pup.
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