Personality
General Temperament
Border Collies are energetic companions who are at their best when they get plenty of mental stimulation and exercise each day. They will play and train for as long as you are willing, and then cuddle with you at home to rest up for the next day of 'work.' They are loving and eager to please their owners, though they can be guarded with people and animals they don't know.
Family Life
Are Border Collies Good with Kids? Border Collies are usually good with children they have known from an early age. Boisterous play, however, can trigger their herding instinct and they may start barking and nipping at heels to keep everyone in line. Though they are not being aggressive, this can be scary for kids.
(Note: Every dog has a unique personality and distinct life experiences that affect his disposition. As a rule, adults should always supervise playdates between kids and their four-legged friends.)
Are Border Collies Good with Other Pets? Border Collies are protective and known to use herding tactics, such as the 'eye,' barking, and nipping, on family pets, as well as strange dogs. While pets accustomed to bossy Borders may take this in stride, unfamiliar dogs will likely get their backs up. Border Collies should be socialized with other dogs at an early age so they are less inclined to view them as a threat to the flock or a creature that needs herding.
Protective
Border Collies are protective of their flock, whether that is a bunch of sheep or their family.
Are Border Collies Good Guard Dogs? In addition to keeping the flock together, Border Collies were tasked with protecting the flock from predators such as foxes or wolves. They keep a sharp eye on their home turf and will bark raucously to scare off interlopers. Once people are invited inside, Borders may be standoffish, but they are not usually aggressive.
Energy Levels
Border Collies are one of the most highly energetic dog breeds. They require owners with the energy, time, and stamina to keep up with them.
Specific Concerns