A collie is a breed, or type, of dog. It is very loyal and friendly and is popular as a family pet.

There are two types of collie, though the main difference is in the style of their coat. The rough-coated collie has a thick, straight coat that forms a heavy ruff about its neck and throat. The smooth-coated collie has a dense, smooth coat. The coat can be brown and white, black with tan and white, blue-gray with black mottling and white markings, or white, usually with darker markings. Both types stand 22 to 26 inches (56 to 66 centimeters) tall and weigh 50 to 75 pounds (23 to 34 kilograms). They both have long, tapered heads and almond-shaped eyes. Their ears stand up straight except for a tip forward at the ends. The tail is long and bushy and hangs straight down.

The collie was developed in Great Britain. The rough-coated type was used to guard and herd sheep. The smooth-coated was used mainly to drive livestock to market. Today the dogs are not needed as much for guiding sheep. They became popular as pets in the 1900s. This was partly because of a U.S. television show and several movies about a collie named Lassie.

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