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Twice the love! Photo: Pucchin Dog's via Getty Images Puppies are adorable. But a puppy with a natural heart-shaped marking? It's so cute we want to scream. Born on August 3 in Japan, the long-haired Chihuahua pup emerged with a perfect heart pattern on his side, just like his big brother, Heartkun, who was born two years earlier to the same mother. Heartkun has a butterscotch-colored heart on his left side, while his newborn baby brother, named -- what else? -- Lovekun, has a black heart on his right side. (We defy you to look at their picture without squealing.) Lovekun was the only one in the litter of four puppies born with the unusual and sweet marking. Both Heartkun and ...