A long-haired male Chihuahua named Heart-kun was born with a heart-shaped pattern of brown fur in Odate, Japan, May 18, 2007. Shop owner Emiko Sakurada said that of the 1,000 dogs she had bred, Heart-kun was the first puppy born with such a mark. There are no plans to sell the puppy.
They still have this puppy today. He has sired quite a few litters and one(1) containing a long haired male which a perfect heart shape as well. This puppy is white with dark brown makings.