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Most Aussie puppies in this article are merles. Aussies come in four acceptable colors including blue merle, red merle, black, and red. The Aussie puppy in the picture above this paragraph is a blue merle with tan makings, aka blue merle tricolor. It has two different colored eyes. This phenomenon is known as heterochromia, which is common in merle Australian Shepherds.
In the United States, the most popular Australian Shepherd coat color is the blue merle. It is extremely rare to see an entirely red or black Australian Shepherd, despite the two colors being AKC-recognized. For more info, see the four rarest Australian Shepherd colors.
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Most merle Australian Shepherd puppies are born with butterfly noses. In other words, noses with pink spots on them. As the puppy matures, the pink spots on its nose may fill. However, some Australian Shepherds with butterfly noses may never develop a completely pigmented nose.
Under the AKC standard, pink spots on the nose of an Aussie one year or older should not exceed 25 percent. Otherwise, it is considered a fault and an entirely pink nose, aka Dudley nose, is a disqualification. Dudley noses, however, are uncommon in Australian Shepherds.
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This is a red merle Australian Shepherd puppy. Red merle Aussies have liver or brown noses. A red-appearing Australian Shepherd with a black nose is a red flag that they may actually be a sable or a yellow dog, both unacceptable colors.