A one-month-old Chihuahua-Jack Russell cross could be a contender for the world’s smallest living dog, according to the U.K.’s Daily Mail. Named Tom Thumb by his owners in the U.K., the petite pup weighs just a few ounces and measures less than four inches from the tip of his nose to the end of his tail. Tiny Tom Thumb was part of a five-pup litter but his siblings are reportedly three times his size. According to the Guinness World Records’ Web site, the world’s smallest living dog, Heaven Sent Brady, lives in Florida and is six inches long. (William Thornton/Zuma Press)
