Using data from University of British Columbia psychology professor Stanley Coren’s "The Intelligence of Dogs," we identified and ranked the 10 smartest dogs.
According to Coren, the top 10 most intelligent dogs need fewer than five repetitions to understand a new command, and obey the first command 95 percent of the time (or better).
The second tier of dogs, which he names “excellent working dogs,” understand new commands after five to 15 repetitions and obey the first command 85 percent of the time (or better). The third tier, which he names “above average working dogs,” understand new commands after 15 to 25 repetitions and obey first commands 70 percent of the time (or better).
These dogs all fall into the "brightest dogs" tier. They are then ranked alphabetically within that tier.