Seems a little warm for sled dogs, but there's photographic proof.
The caption from the original article: In the top center of the image, outlined in a white box and shown in the enlargement at upper right, is a cluster of impact craters on Mercury that appears coincidentally to resemble a giant paw print. In the "heel" are overlapping craters, made by a series of impacts occurring on top of each other over time. The four "toes" are single craters arranged in an arc northward of the "heel." Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
For some reason, pasting in the URL (it's a long one) is causing the message to crash. You can find it on Space.com.
For those playing the "Star Tails" variant remember that the bonus for a balanced sled with no gravity is multiplied by a factor of 10. This can, of course, cause difficulty going round corners.
You would not believe how long it took them to find this marketing ploy. We put it there just before Essen 2008. Admittedly, the marketing budget of £1.25 billion pounds has still to pay for itself but we thought it was worth it.
I look forward to Venus being checked for signs of ostriches.....(hint, hint). Oh, and you would not want to know what we have planned for Uranus.