I was cleaning out the girls cage last night and my friend gave me a cat toy (ball with bell in it) for the girls to have and they all seemed thouroughly amused with it. But when Dandy went in the back of the cage with the ball, all of a sudden it looked like she just "puffed up". I dont know how else to describe it. She wasnt being aggressive (although I wasnt sure) she kinda sat there looking a little weird and was swaying back and forth on her hindquarters. Her hair was sticking up and it looked like she was severely bloated. My friend said there was a little ball of catnip in the center of the ball. She was still allowing me to pet her and was climbing all over us. Was this because of the catnip? Can the puffy thing be fear or excitement?