Monty shoots off like a rocket too after he has done his thing! I keep the cat litter upstairs and he doesn't do stairs so he hasn't had a chance to get into that. Chumly went through a brief phase of poo eating as did Sadie, our American Bulldog but it didn't last long at all, thank goodness. Those were the only two out of our long list of dogs of various breeds.
No, they don't eat dog poop Thank goodness, but they have eaten the cat litter, but they can't get to it anymore, I keep it in the laundry room in the basement, and they won't go down the stairs. They also like to eat rabbit turd outside in the grass. Yuck. I had a Jack Russell who loved to eat Goose Poop, it was her favourite. So Nasty.