Some popular breeds of dogs known for their intelligence are:
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Border Collie
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Poodle
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German Shepherd
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Golden Retriever
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Doberman Pinscher
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Labrador Retriever
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Papillon
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Shetland Sheepdog
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Australian Shepherd
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Rottweiler
These breeds are often highly trainable and excel in activities that require problem-solving skills and quick learning.