"they can also understand more than 150 words and intentionally deceive other dogs and people to get treats, according to psychologist and leading canine researcher stanley coren, PhD, of the university of british columbia. he spoke saturday on the topic "how dogs think" at the american psychological association's 117th annual convention."
according to several behavioral measures, coren says dogs' mental abilities are close to a human child age 2 to 2.5 years.
http://www.sciencedaily.com/releases/2009/08/090810025241.htm
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