A couple of weeks ago my 5 month old pup took a tumble while playing and hurt his front right leg. He was whimpering and holding it up, it didn't bother him when I touched it so I rubbed his shoulder/elbow and definitely heard and felt a 'click'

after which he carried on playing and running around fine. Well, it happened again today :( he slipped on an empty pop bottle he was playing with and just sat there holding his leg up (no whimpering this time) so I gently rubbed around his elbow area again and again it clicked! He was running around again straight after! Should I be worried?

Thanks.