Better to grab a plastic bag or shovel, retrieve the dog crap, and follow the dog walker home with it. Then toss it on their yard.
So instead of picking up the poop every day like I had been doing, I waited a week so that the offerings were in various states of decay. Then I took a shovel and threw each piece of poop onto their driveway. I made sure to use a throwing motion so that the softer, fresher items would splat into the widest area. The driveway was pretty well covered by the time I got done.
I watched as the wife pulled in from work first and saw her tip-toe through the tulips to the front door. When her hubby got home 30 minutes later, he proceeded to get a shovel and hose from his own garage and clean up the mess.
The dogs never came into our yard again, and the neighbors never asked me where the poop came from.