YES!!! It hurts

Not as much as before, now she knows how to jump up in the right spot. But when she slips or jumps up too high on my back.... auch!
A friend of mine, who plays frisbee, has a vaultjacket. It's actually a surf vest, a sleeveless jacket made with the stuff that they use for surf suits or diving suits. That really helps.
But I don't have that, might have to concider getting one, if I decide to move on to the backvaults(dog jumping on your back and jumping into the air to get the frisbee)

But so far I have been using a thick sweater or my softshell jacket.