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According to Coren, the top 10 most intelligent dogs only need fewer than five repetitions to understand a new command, and 95% of the time (or better) obey the first command. 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% 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% of the time (or better).