So, you’re in a dark alley, and there’s a strange dog coming toward you. What would make you more nervous, a Chihuahua or Siberian husky? If you said the husky, you might want to reconsider. Joining the Petcasters is Dr. James Serpell, director of the Center for the Interaction of Animals and Society at the University of Pennsylvania. In a new study, Dr. Serpell and his colleagues identified the least and most aggressive breeds of dogs and found that size isn’t be best measure of the potential for trouble.

Plus, Guinea pigs take Hawaii, Emily apologizes to her sister and Steve flogs himself over accidentally letting Jack out.

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