So I was about to take a shower when I noticed some wierd little scratches on the back of my right shoulder. There are four scratch marks, the first three are about an inch in length and maybe 4 or 5 millimeters apart from each other. The fourth scratch mark was probably twice as long and maybe 7 millimeters away from the others. My first impression was that the scratch marks look like it was from a cat. The problem with this logic is that I don't have a cat nor have I come into contact with any cats recently. The only animal in my house is my dog (another reason why there couldn't have been a cat) and she's a german shepherd, not exactly the right type of animal that could have left cat sized scratches on the back of my right shoulder. Does anyone have any ideas as to what may have left these marks? I know I'm probably not going to get any useful answers but I'm at a loss of explanation.