Pet Description: Meet Libby Little Libby was found abandoned at a state park in Tennessee and was taken home by one of HART's fosters. She's approximately a year old and weighs 25-30 pound. HART was told that she was a Jack Russell/Chihuahua mix, but we definitely see some Boxer or Pug in her cute face. Libby gets along with the two other dogs in her foster home but likes to be the boss. We're not sure how she is with cats as she hasn't been tested with them. This little girl is house and crate trained but is still going through the chewing phase.