Join Date: Sep 2010
Location: Winston-Salem, NC
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A modification of Dunbar's pen is often used to rehab puppymill adults - it does a reat job of encouraging a dog to potty in one space and not where they sleep.
OP, there was a pretty thorough thread on housetraining a while back - you might want to check that out.
You'll also want to make sure you keep the pups on a good schedule, if you're changing their food, do so slowly, and provide lots of interaction and playtime.
Every hour of the light and dark is a miracle. Every cubic inch of space is a miracle. (Whitman)