If the issue is simply whether or not eating dog is appropriate, then I largely agree with you: pigs and horses are good counter-examples. Of course these examples aren't perfect since dogs are highly domesticated and have been bred to be highly socialized and loyal to humans, and they pick up on human visual and body-language cues better than any other animal we eat.
The CNN report, however, makes vague allusions about how eating dog may be cruel. And indeed, it is exactly the cruelty involved in some dog-slaughter practices that have been the focus of protests by people like Brigitte Bardot: it is widely thought that adrenaline in the bloodstream will tenderize the meat, so dogs are often beaten and tortured to death in the belief that it will make for better food. I had the misfortune to hear the pathetic and harrowing cries and yelps of a dog being beaten for over an hour while in Vietnam (I was on a moored boat in Halong Bay, and a dog was being beaten in a nearby village), and it's difficult to accept that this is the price of eating dog.