Stanley Coren, a leading psychologist, canine specialist and researcher claims that dogs can understand about 165 words and even mislead other dogs and humans in order to be given treats. The scientist also claims that dogs are as intelligent as a 2-year-old child and resemble higher primates and even humans in their ability to solve complex problems.
Coren, who is also an author of several book on canines and their behavior, points out that there is a difference in dogs’ intelligence depending on their breed and training. The researcher distinguishes three types of dog intelligence : instinctive, adaptive and working (obedience). The first type is associated with what the dog is bred to do; the second one shows how well the dog learns to solve problems by exploring its environment; the third type of intelligence is an equivalent to school learning. According to several US studies some of the most intelligent breeds in terms of instinct and learning aptitude are Border Collies, German Shepherds and Labrador Retrievers.