Sorry it took so long, but Ive been swamped with work. Here are some of the pictures I took earlier last month. I wish I would have gotten out there before we had a warm day. The tracks themselves are about 20 inches apart from each other and front track to rear track is about 65 inches. There are no big dogs that live in the neighborhood. The biggest one is a German shorthair and it is never far from its house, but these are way to big for a shorthair. On a good day, you can make it to the Sears Tower in 30 minutes from where these pictures are taken. If they aren't from a big cat, sorry about it, they are just nothing like Ive seen before here in the Midwest, Especially in backyards in the greater Chicagoland area.

Also, there are some coyotes that live in the neighborhood and the tracks cross here and there and you can tell when they cross there is a BIG difference in the tracks. Let me know what you guys think. Im up for suggetions of what it is.