MELISSA BLOCK, HOST:
A story now about dogs. The health hazards for our best friends are many - ticks, cars, lots of chocolate. But there's another danger that may not be on your radar yet. Here is an encore broadcast of a report from Laura Klivans of member station KQED. She first learned about this danger in her very own living room in San Francisco.
(SOUNDBITE OF ARCHIVED NPR BROADCAST)