I can't believe how common this is in little dogs. Bentley did it too and I bought 4 small plastic garden shovels ( the little hand held ones) I put one in each corner of the yard and as soon as he goes, I scoop and toss it over our fence (there are no houses behind ours) and on walks if he stops to go I tell him "no" and keep him moving. My therory on this is them being kept in a crate or pen with litter mates, either them trying to keep the area clean or they jsut are hungry and it's available, maybe they learn it from mom trying to keep things clean. Anyway they sell a product that you put in their food that helps with this and you can also use msg. I don't use either but it is commonly used by others.