38 Dog Breeds That Require Extra Caution and Understanding

17. Basenji

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The Basenji breed is over 5,000 years old and requires constant stimulation. These "barkless dogs" yodel instead of barking, making their communication difficult to interpret. Basenjis weigh only 22–24 pounds but are energetic and need to run. Without sufficient activity or understanding from their owner, these adorable dogs can become frustrated and misbehave.