ROFL! I have one like this too only she's 15 years old! The dog is smart enough to run from her. I think he got the hint the first time she ran up a door frame and hung there are about 5 feet from the ground.
She does not have claws, just really strong toes. Doesn't hurt that she only weighs 4 pounds.
Last night she pounced my father in law's dog, who is staying with us for the week. B is a wimp and started whining. difficult child 1 and I both rolled.
A few weeks ago she pounced the hedgehog. I don't think she'll be doing that again any time soon.