Extra cognitive ability in dogs.

Dear Sir, In the course of general small animal practice, occasionally a dog would respond to one of the posters on the wall that depicted a dog or a cat. The response could be standing on hind legs to see it more closely or attempt to smell it, or staring at the poster and vocalizing in some way. At some point, I started asking, “Does your dog watch television?” and for those dogs that had responded to a poster, the answer was invariably...