When he was running in the room his front paw got tangled up by the charging cords for a second, I'm not sure what happened, but after that he kept lifting off his right front paw from the ground. Visually there's no difference between his right and left front paws, and when I touch or gently squeezed around his right paw, he seemed find and didn't show any pain signs. He's eating fine too, but it worries me he might be injured because he kept flicking and lifting his right paw. Last something like this happened is when he broke his nail, but his nails were good when I check today.