Thanks for the input guys.

He is just very slightly favoring it today so I am going to watch him and see. I don't really have rocks in my backyard but it is very uneven.
I'm going to see if I can get him to stay stillish and if not I will crate him like AC suggests.
I feel like a first time mom with the ACK my baby has a slight fever type stuff.
Okay so now I ended up crating him because he was running up and down the stairs and starting to limp more, silly pup.