The newpaper report doesn't really suggest they are clever to me but that they can see 2D tv, of course they are going to touch a picture of a dog more than that of some boring landscape, if a dog is interested enough in the bum of another dog they are going to like dog pictures. It is well known that dogs will sit starring or even kick up a fuss at the shear sight of a dog or other animal on tv, esp if it is 'youve been framed'
The fact dog's provide a quality of life for the disabled, is enough to prove they are clever to me. To watch a dog lead a blind person round town shopping and doing visual commands to tell a deaf person the phone is ringing or there is a present risk of danger, whether that be fire etc. Amazing.