I just adopted a Pomeranian dog yesterday. I've shared a home with a Spitz dog (Siberian Husky) before. These dogs need a job. They LOVE to pull. So I was looking for a tiny dog cart online, and all I got for pages and pages was carts for me to cart the dog around. This says something about our culture that isn't pleasant.
I'll build the little guy a cart, probably out of a kid's toy. He can bring the mail up the driveway every day. That solves the problem for the dog, but not for our culture.