They rank a low 42nd in Stanley Coren's The Intelligence of Dogs, but keep in mind that Coren's criteria focus on how fast a dog can learn obedience "tricks"—a limited test of intelligence.
The Pembroke Welsh Corgi has been ranked at #11 in Stanley Coren's The Intelligence of Dogs, and is thus considered an excellent working dog.
According to Dr. Stanley Coren, an expert on animal intelligence, the Shetland sheepdog is one of the brightest dogs, ranking 6th out of 132 breeds tested.
They rank 53rd in Stanley Coren's The Intelligence of Dogs, being of average working/obedience intelligence.
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