I'm pretty decent at distinguishing the differences. I still look, just to double check, and I will admit I have been surprised when I saw what I thought was a squirrel

One tips I heard a long time ago ---> Deer will usually take steps in 3's, 5's, 7's, etc. So that's one way of telling the difference I guess. I've never really thought about it too much, but it has seemed to be fairly accurate as I do think about the past few weekends...