I have a crazy fetching dog. We go to the dog park and we play fetch with a chuck-it. He proudly carries his tennis ball around the entire time.
When he wants to poop, he will search for the just-right spot. Then he drops his ball there. Then he turns in circles to find the best pooping angle. Then he poops. So far it hasn't landed completely on top of the ball, but the pile is always right next to the ball. Sometimes touching. Then I pick up the poop, and he picks up the poopy ball, and it's fetch time again! Yuck!

You can tell he doesn't like to grab the ball after it's been so close to the poop -- he stands back as far as he can and just stretches his neck out to grab the ball -- but this does not deter him from dropping the ball in his chosen spot the next time he has to go.
I don't quite get it. I sure wouldn't want to poop on my favorite toy! I don't know if he's marking the spot with the ball, or he just drops it at the last possible second before pooping, or what. I guess that's why I'm not a dog!
Anybody else's dog poop almost on top of their toys?