Dogs are very intelligent animals. Psychologist and leading canine researcher Stanley Coren, PhD, of the University of British Columbia realized through hundreds of experiments that dogs’ mental abilities are close to a human child age 2 to 2.5 years. They can understand more than 150 words and make other dogs and people give them treats. Coren says that dogs’ intelligence is different in each breed. There are three types of dog intelligence: instinctive, adaptive and working and obedience. The best working breeds with high level of obedience intelligence are: Border Collies, Poodles, German shepherds. Fourth on the list is Golden Retriever, than Doberman, Shetland Sheepdog and Labrador Retrievers. As for language, there are high intelligent dogs that can remember and understand up to 250 words! Scientists believed that ability was only found in humans and some apes. Besides that, Coren learned that dogs are good with math, they can count to five and can notice errors in simple computations. Also dogs are good at solving spatial problems, they can find better routes in the environment, and learn how to operate simple mechanisms, such as latches.