Help with flea bites...

Hello all!

Just wondering, anyone have any ideas of how to get dogs to poop in a certain area only? Mine tend to drop bombs all over the garden, we have a huge garden and daily it is strewn with little blobs - they tend to poop, walk a few paces, poop again and so on and so on and so on. Hilarious to watch but what a schlep to pick up. I once tried the 'water in a bottle' idea, but they went right on ahead and pooped on the bottle! So that put paid to that! Anyone have some ideas on this?