My border collies are the smartest, most obedient dogs.
My mother has a border collie, but I don't know much about them myself. Are they usually very obedient?
Yes, they are.  They typically dominate sheep dog trials and dog sports.  Is your mother's smart?
She seems pretty smart, actually. I've never seen a sheep dog trial, but I think it would be really interesting to watch!
Sheepdog trial
A sheepdog trial (also herding event, stock dog trial or simply dog trial) is a competitive dog sport in which herding dogs move sheep around a field, fences, gates, or enclosures as directed by their handlers. Such events are particularly associated with hill farming areas, where sheep range widely on largely unfenced land. These trials take place in the United Kingdom, Ireland, South Africa, Chile, Canada, the USA, Australia, New Zealand and other farming nations.
Some venues allow only
Border Collie
The Border Collie is a working and herding dog breed developed in the Scottish borders for herding livestock, especially sheep. It was specifically bred for intelligence and obedience.
Considered highly intelligent, extremely energetic, acrobatic and athletic, they frequently compete with great success in sheepdog trials and dog sports. They are often cited as the most intelligent of all domestic dogs. Border Collies continue to be employed in their traditional work of herding livestock throughout the world.
Description.
In general, Border Collies are medium