When Jasper got up this morning, he was just walking around and then he just started crying and moving his paw around...

I went over to look at it to see if anything was wrong with it and didn't see anything so I just rubbed it and eventually he was fine.

Since then(almost 2 hours ago), it has happened several times, like he is getting cramps in his paw

Does anyone know what could have caused this, or if I should be concerned?

Thanks