If I scratch by Colby's tail, she opens her mouth and makes her huffy happy noises while wiggling her bottom around in the air, LOL. Sometimes while petting Tippy, she'll rub her bottom up and down on my leg or the chair I'm sitting in. And she likes to put her head between my legs while I scratch her head. May, whenever she wants attention or food, will pick her paw up, and she loves rubbing against me.