Your cat has vanished from inside the house. He either got outside when you opened the door and you weren't quick enough to catch him, or he
This is likely due to a problem in her knee, less likely hip or back. This requires a good neurologic and orthopedic evaluation from your vet. Thankfully, she does not show overt signs of pain, however, holding up the leg is actually a sign that stepping on it is painful... dragging is another issue. Please have her evaluated as soon as possible. Best of luck!


