The Border Collie is the smartest dog breed when it comes to obedience
& work intelligence.
In fact, the world’s most intelligent dog was a Border Collie who knew
over 1,000 nouns. But it doesn’t stop there. They’re some of the best
herding dogs with extremely high instinctive dog intelligence. And with
their ability to learn from the past, Border Collies are believed to
have a high adaptive IQ.