The Collie began as a Scottish sheep-herding dog and was refined in Victorian Britain into the elegant dog most people picture when they think of Lassie. In the US there are two varieties of one breed: the Rough Collie with its long mane and frill, and the Smooth Collie with a short, dense coat. Both have a double coat that sheds heavily, and adults usually weigh 50 to 75 pounds.
In San Diego, a Collie's sensitive, people-focused nature suits a household that's home often and enjoys regular walks on the city's leashed canyon and park trails. Herding instincts can show up as barking or circling, and Collies vary, so get to know the dog in front of you rather than assuming. Brushing a few times a week, and more during shedding season, keeps the coat manageable.