Yep, Rob is spot on. A doe's back hips are wider to facilitate birthing fawns. So, her rear hoof willnaturally land to the outside of the front. A buck doesn't have that, so the rear hoof will land pretty much directly on top of the front. Not so perfectly that it looks like 1 track, you'll definetly be able to see that it's 2.....

I didn't believe that either when I read it....though it is logical. Then I started paying attention to tracks I was seeing, and looking at the tracks after I see deer pass.....Yep, it's true enough alright.