Merle dog breeds have distinctive coat patterns due to the presence of the “Merle” gene. Merle coats result from a mutated gene that produces less melanin in some parts of a dog’s skin and fur.

And when it comes to cuteness, the Mele Long-Haired Chihuahua featured in the video below has it in spades. In fact, his unique coloring has made him so popular that people are totally falling in ...