He is a 7 year old lab x (7 last week) and is really healthy and strong. He loves his walks and is very keen to run and get out and about. However, recently, when he gets up from a nap or when I call him to go out for a wee after he has been laying for a while his legs are wobbly as if he has pins and needles. Once has has taken a couple of steps he seems fine again. Should I be worried? Or is this normal? Thank you