Kristen Bell thinks her dog is a vampire.

The 'Astro Boy' actress - who adopted a 12-year-old rescue dog after the pooch was left living in an animal rescue centre in the aftermath of Hurricane Katrina – has admitted she doesn't like the animal which has toilet problems and is convinced it will "never die."

She is quoted by Absolute Now as saying: "I don't really like her. I actually think she might be a real live vampire and never die. She's almost totally blind and deaf. When you are in the house, you can hear her pooping from the other room. It's like bowling balls hitting the floor!"

Kristen is currently preparing to marry her actor fiance, actor Dax Shepard.

The couple got engaged during the Christmas period after dating for two years, and Kristen debuted her stunning ring as she appeared on stage at the Grammys in January.