"Spazz Bubbling Underneath!"
That fits Bella to a T!
I had a picture of the two of them at my in-laws' house. FIL was trying to convince their landlord to let us bring the dogs to the house, going on and on about what good dogs they are. Landlord replied, pointing to Bella, "I don't know. That one looks a little mischievous to me."
We were in my grandma's backyard, which has a variety of bird and squirrel feeders strategically located around it. The squirrels were literally taunting the dogs. One came every morning - my nephew named it "Amy" - and would chatter at Bella. Then when she was fully attentive, turn his rear end toward her and flick his tail 'til she went nuts. I'm shocked she stood still AT ALL.