This is really quite strange. I've never seen anything like it. Why in the world would a raccoon hump a dog? I certainly have no clue. Perhaps it was blind.
For those of you who live in the Sunnyvale/Mountain View area in California, have you ever seen this thing? I have. I saw in the parking lot at the grocery store once, and I've seen it parked on the side of the road before. It's really quite odd though. What does it mean? (I didn't take this photo by the way.)