This is "Heart-kun". Isn't he the cutest?
He's a long-coated chihuahua in Odate, northern Japan.
Heart-kun was born on May 18, 2007 as one of a litter. The shop owner, Emiko Sakurada, has bred over 1,000 of this kind of dog and said that he is the first one to have these markings. (Well, duh!)