Lola my Himalayan loves to be brushed and will annoy me FOREVER until I brush her. She's never liked her belly touched and will go zombie on you if you touch it. She recently started rolling on her back when being brushed and allowed me to brush her whole underside. It surprised me, so while brushing I started lightly scratching and rubbing her stomach with my hand. ZOMBIE mode....she tweaked and bite me quite good! Only thing I can think of is that she had a traumatizing event with her belly and I think it was with matted hair. She was given up for adoption and I adopted her. I noticed she had a lot of hair missing from her underside when I got her. Had to be from hair mats.