my tech nine seems to do the trick everytime.....naw dont know really maybe if you have a older dog that is house broken and they see what he or she does might help but i really dont know
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PUT THEM ON A TIGHT SCHEDULE THEY ALL EAT AT THE SAME TIME PUT THEM ALL OUT AT THE SAME TIME ABOUT 20-30 MIN AFTER EATING WHEN THEY ALL GO BRING THEM ALL IN BUT YOU GOTTA KEEP THE SCHEDULE AS CONSISTANT AS POSSIBLE
I set a good foundation of "kennel training" first, because most pups and older dogs wont shit where they sleep. After the kennel work I start to let the pups out one by one and start teaching them not to go in the house. you will have accidents at first...jump all over that shit, by showing them were you want them to shit. like boogeyman said consistency is the only sure win for you and your pup. I am currently working with 3 pups now.