The Australian Shepherd, often known simply as the 'Aussie', is a medium-sized breed of dog that was, despite its name, developed on ranches in the United States during the 19th century. They often excel at dog sports such as dog agility and frisbee and are also highly successful as search and rescue dogs, disaster dogs, detection dogs, guide dogs, service dogs, and therapy dogs. They are considered the 17th-most popular dog breed in the United States. Double merle or homozygous merle occurs when the offspring of two merled parents inherit two copies of the dominant merle gene. They are considered the 17th-most popular dog breed in the United States. Double merle or homozygous merle occurs when the offspring of two merled parents inherit two copies of the dominant merle gene. The odds of this are 25% for each pup born from such a litter. Due to the contrast between eye problems and blue eyes, eye conditions in blue-eyed dogs are much easier to spot.
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