| Country of origin: | Great Britain |
| Registries: | AKC, UKC, CKC |
| Occupation: | Herder, companion |
| Size: | 22 to 26 in tall; 50 to 75 lbs |
| Longevity: | 10 to 12 years |
| Exercise: | Moderate |
| Training: | Easy to moderate |
| Grooming: | Easy for the smooth coat; difficult for the rough coat |
| Colors: | Sable, sable and white, blue merle, tricolour |
This breed was once regarded as the same as the Rough Collie, as both long- and short-haired individuals might occur in a litter. But the two have diverged, with all Smooth Collies traceable back to Trefoil, a tricoloured dog born in 1873, and they may have some greyhound in their heritage. This strain is less popular than the Rough Collie, and some breeders say it is more inclined to be both shy and a little fearful.