Its worth a shot hun, My OH laughs and say he can set his watch by mine pooping haha.
Just be conisistent and everytime he poo's give him a nice tasty treat and lots of praise, he will come good honestly, afterall he has learn bladder control, and he is still a baby at 20 weeks.
My collie is 20 weeks, I say "get busy", then i say, "do you need to get busy again", my neighbours must think im nuts haha

xx

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Sarah xxx