Bella doesn't so much "buck" as sort of scratch with her back legs, flicking them backwards. It started out as something she would do if she had a dingle, but now, she does it when there's something, anything really, she doesn't like, or sometimes it seems like she just does it when she's really excited. If I spray my perfume and she walks into to the room, she makes a kind of growly whine noise (I don't know how to describe it because it's neither really??) and starts flinging her legs back scratching carpet as she goes!! It's the funniest, most adorable thing!!
She also does the "wiping the scent of the kill", or whatever that is, off all over the carpet, etc... after she eats. And of course freshly after a bath, she has to scoot her whole body all over the house, wallering around!!
The funniest thing she does is talk back.....shame, shame! If I say "No" or "Ouch", she will make that growly whine noise (it isn't a growl at all, but I don't know how to describe it!!) or bark. I have to say, "We don't talk back" and "No maam" a couple of times before she gives up, but she REEEEAAALLLY hates "ouch!" That one really gets her worked up! It's like she's arguing with you that it really didn't hurt that bad, not enough to stop playing with me!! Soooo cute! (I'm probably bad for doing this, but we "talk" back and forth several times until we reach a compromise

....I don't want to stifle her!! She's just telling me what she thinks after all!!

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