A lot of people bring their dogs. My favorite is the guy with one black and one white dog. He drinks coffee and throws tennis balls, the dogs race around and plunge into the lake and race back to shake on him.
The city encourages dog owners to pick up after their pooches. There are more than 100 mutt mitt dispensers along the trails and periodic garbage cans for disposing of the filled mitts.
Even so, an estimated 1,327 pounds of dog waste ends up in the lake every day - nearly a half million pounds per year. And the average-sized dog dropping contains 3 billion fecal coliform bacteria.
That's more than just fertilizer.