I noticed recently that when wookie sits on his haunches his left front leg starts to twitch a lot. its like its buckling or something but then sometimes it doesnt. I am worried that there is something wrong; he hasnt fallen down or jumped down anything like that so i am really not sure what the problem is. when i got him from the breeder she checked his joints on all his legs and said they were strong. when i poke him and squeeze his legs he doesnt cry, he is still as playful as ever. what could be the cause of his shaking leg?
any thoughts or ideas would be very helpful