Dogs at least as smart as 2-year-old children

Dogs can count. They can also understand more than 150 words and intentionally deceive other dogs and people to get treats, according to psychologist Stanley Coren, PhD, of the University of British Columbia. He spoke Saturday on “How Dogs Think” at the American Psychological Association’s annual convention.
Coren has reviewed numerous studies to conclude that dogs have the ability to solve complex problems and are more like humans and other higher primates than previously assumed. He says dogs’ mental abilities are close to a human child age 2.5 years.
The intelligence of various types of dogs does differ and the dog’s breed determines some of these differences, Coren says. “There are three types of dog intelligence: instinctive (what the dog is bred to do), adaptive (how well the dog learns from his environment to solve problems) and working and obedience (the equivalent of ‘school learning’).”
Data from 208 dog obedience judges from the United States and Canada showed the differences in working and obedience intelligence of dog breeds, according to Coren. “Border collies are number one; poodles are second, followed by German shepherds. Fourth on the list is golden retrievers; fifth, dobermans; sixth, Shetland sheepdogs; and finally, Labrador retrievers,” said Coren.
As for language, the average dog can learn 165 words, including signals, and the “super dogs” can learn 250 words. “The upper limit of dogs’ ability to learn language is partly based on a study of a border collie named Rico who showed knowledge of 200 spoken words and demonstrated ’fast-track learning,’ which scientists believed to be found only in humans and language learning apes,” Coren said.
Dogs can also count up to four or five, said Coren. And they have a basic understanding of arithmetic and will notice errors in simple computations, such as 1+1=1 or 1+1=3.
Four studies he examined looked how dogs solve spatial problems by modeling human or other dogs’ behavior using a barrier type problem. Through observation, Coren said, dogs can learn the location of valued items (treats), better routes in the environment (the fastest way to a favorite chair), how to operate mechanisms (such as latches and simple machines) and the meaning of words and symbolic concepts (by listening to people speak and watching their actions).