Very talented dogs remember the names of toys for years.

Border Collies are a particularly intelligent breed of dog and are often used in studies of animal cognitive abilities.

American psychologists have taught border collies to name more than 1000 objects.

Involving owners in training helps strengthen the bond between people and dogs and improves the animals’ memory.

On average, dogs can learn simple commands at about three months of age, but name recognition requires more advanced training.

Dogs use different parts of their brains to distinguish familiar people from strangers, just as humans do.