Oh for sure! I had a German Shepherd many years ago. I took him on vacation with me to the family cottage and I used to feed him in the bedroom. One day after putting down his food bowl I happened to be coming in just as he was coming out and he gave me what I can only call a look of disdain. His bowl was empty but on the floor were 3 neat piles of kibbles. I had a funny feeling about those piles so I counted them. Every single pile contained 21 kibbles! To this day I have no idea what he was trying to tell me
As for the intelligence "rating", I always thought it was based more on that sense of self I mentioned and how it compares to psychological development in infants.