Max is still limping

He's in very good spirits and I'm trying to keep his activity level down, which has been quite low for about 5 days.
I still don't know what body part is bothering. It looks like his front right paw or leg. I emailed my vet last night and said to give it a little more time. I can bring him in to see if she can isolate the injury and then do x-rays if necessary. He gets his 4th shot next Friday, Oct. 1st so i'm debating if I should wait that long.
He wants to play so badly.