Last year I fell asleep all snuggled up in a recliner in my livingroom (I confess to having been online until about 2 AM on that Saturday night). Early the next morning I felt something slapping at my foot. With eyes still closed I thought it was probably my dog. Then I realized that whatever it was kept slapping my foot far harder than my little dog's tail possibly could. I woke with a start to a strange dog in my house. It was a young dog that appeared to be a pitbull/Boston terrier mix with huge paws.
It was very sweet and friendly, and apparently followed my dog in through the doggy door.
I felt fortunate that it wasn't a skunk or something!