The exact origin of the name collie is uncertain; it may derive from the Scots word for 'coal'. Alternatively it may come … See more

Collies are generally medium-sized dogs of about 22 to 32 kg (48 to 70 lb) and light to medium-boned. Cattle-herding types are stockier than sheep-herding types. The fur may be short, or long, and the tail may be smooth, fe… See more

Some collie breeds (especially the Rough Collie, Smooth Collie, and the Australian Shepherd) are affected by a genetic defect, a mutation within the MDR1 gene, formerly known as "ivermectin sensitivity", but now known to c… See more

Herding dogs of collie type have long been widespread in Britain, and these can be regarded as a landrace from which a number of other landraces, types, and formal breeds have been derived, both in Britain and elsewhere. … See more