Is your border collie a lethargic couch potato? Is your golden retriever bad with kids? Is your German shepherd too timid to guard your home?Turns out, there may be good reason why your pooch doesn't act as expected. Regina G. Barber talks with writer Katie Wu about the science of dog breeds, including how much a dog's personality is linked to breed. (Hint: less than you might think!)Got personal stories of your dog breaking its behavioral mold? Share with us at shortwave@npr.org.