You can get those scent things that encourage them to go where you put them, not sure if they work for poo's or just wee's!?!

Milo used to go up on the stones behind the shed all the time for 1's and 2's, as soon as we laid turf down he started going on the grass! Damn dog has killed half the lawn already! Better than the dog we had stopping last week though he only ever marked on my blackberry bush, it's well and truly dead now

__________________