Earlier dogs were also more sturdy in build and reportedly capable of covering up to 100 miles in one day. In the UK the Rough Collie is no longer used for serious herding, having been replaced by the Border Collie, though in the United States and a number of European countries, there has been a resurgence in the use of the Collie as a working and performance dog. Four coat colors are recognized for Rough Collies: The size and weight varies among breed standards; male collies can stand 55.8 to 66 cm (22 to 26 in) at the shoulder; the female averages 5 cm (2 in) shorter. US and UK standards may differ. The UK standard calls for dogs to be significantly smaller than those under the American Kennel Club.
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