How Intelligent are Dogs?

Dogs' Intelligence On Par With Two-year-old Human, Canine Researcher Says, is a Science Daily article, indicating that dogs show evidence of having some relatively advanced cognitive skills. Psychologist and canine researcher Stanley Coren, of the University of British Columbia, has concluded that dogs can solve complex problems and that they are more like higher primates than commonly thought. His conclusion was based on reviews of numerous studies. Coren also has authored books on dogs and their behavior.

Coren estimated the mental abilities of dogs to be comparable to humans between the age of two and two and a half years old. Dogs are capable of learning words (165-250) and signals and demonstrate understanding of simple arithmetic. They are even said to be capable of deceit in order to secure rewards.