a living being used as a fashion accessory, like a handbag or a scarf, except that it's alive; often dressed up in cutesy little outfits
Paris Hilton rarely goes out without her bio-accessory, Tinkerbell the Chihuahua. Britney Spears used to carry around her bio-accessory, Bit Bit, until she started carrying around babies instead. Why didn't Kevin carry the dog? Maybe that's why she divorced him: he wouldn't carry the little dog.