Intelligence isn't a matter of what you can brain wash an animal to do.
The only thing that dog is pulling the blind person down the street for is so it can get it's next treat.
Cats and Dogs don't have a word vocabulary, the associate the varying pitches coming from our mouths with something they've been either beaten into submission to understand, or saturated with treats.
If you think dogs are super intelligent, my dog will prove it all wrong. Dumb as dirt doesn't even begin to describe it, I'm not even sure it knows it's own name...
-SW