Don't worry about it too much, Blue. If his paw hurts too much for him to stand on, he'll calm down. Even dogs aren't that dumb.
He'll regulate himself to the point where it doesn't hurt so much anymore, then he'll just let loose again. Also, dogs are NOTORIOUS fakers.
My old lab would limp around on his poor, sore paw, playing it up for all he was worth, then he'd see one of his other dog buddies out on the field, and he'd run over like there was nothing wrong with him. And it was only after we'd left again that he seemed to realize "oh yeah, my paw was hurting. Ow! Ow! Ow!" and start limping again. The little sympathy mooch.
I miss my lab...