Summer Swimming Leaves Dogs Vulnerable To Waterborne Parasite

We've all heard about the dog days of summer, when lake water starts to look like only your dog would swim in it. But it turns out there is a real threat to swimming dogs that is invisible, Bill Hudson reports (1:55). <br /> <br /> <em>WCCO 4 News at 6 - August 5, 2013</em> <br><br>