Dog stroller?

We were driving down 700 E next to Liberty Park recently and Katie told me that she saw a dog in a stroller. I was paying more attention to driving so I hadn't seen it. So we turned and went into the park to try and find it again. And sure enough a lady was walking her dog... in a stroller! I had no idea they actually made strollers for dogs. I thought the point of walking your dog was to let your dog actually walk.

We tried to snap a picture but there were too many trees in the way and we couldn't stop and block traffic, but here's an example we found on the internet.