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. The Australian Shepherd is traditionally a medium-sized breed. They can weigh from 35 to 70 pounds (16 to 32 kg) and stand from 18 to 23 inches (46 to 58 cm) in height. 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.
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