Misha used to do this as a pup, but I haven't seen her do it for ages. Because we were housetraining at the time I used to make sure that I always had some treats and used to try and call her to me straight after she'd had a poo and give her a treat. ie. try and have something a bit more tasty (iyswim) and call him straight to you after his been to the loo. Misha always rushes to me as soon as she's had a poo, its just become habit now. Once I'd got her inside, I'd put a little curry powder on the poo so that if she went back to it she was never tempted to eat it (you do get some funny looks from the neighours

). I did try the courgette & pineapple (made her sick), also the tablets (think they're called Deter), never found that they worked. You could also try changing the food that you feed.