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 In the UK the Rough Collie is no longer used for serious herding, having been replaced by the Border Collie, though in the United States and a number of European countries, there has been a resurgence in the use of the Collie as a working and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. Canine cyclic neutropenia is a cyclic blood disorder that is usually fatal to affected puppies. The disease is also referred to as 'gray collie syndrome', due to affected puppies having a pale gray, pinkish/gray or beige colouring, none of which are normal Rough Collie colours. Puppies that survive through adulthood are plagued with immune disorders throughout their lives and rarely live more than three years. DNA testing can help detect carriers of the recessive gene that causes the disease.
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