4 inch long Chihuahua Puppy could be World’s Smallest (and Cutest!)

A four week old Chihuahua/Jack Russell mixed puppy could very well be a contender for the world’s smallest living dog, according to the U.K.’s Daily Mail.

The puppy, named Tom Thumb by his owners in the U.K., weighs just a few ounces and measures less than four inches from the tip of his nose to the end of his tail. The tiny Tom is part of a litter of five but his siblings are said to be at least three times as big.

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.