Why picking up after your dog matters more than you think

It might be tempting to think of dog waste as no big deal. After all, wild animals go wherever they please, and the world keeps on turning. But dog waste is fundamentally different from the droppings of deer, foxes or other native wildlife. Wild animals eat natural, local diets, and their waste breaks down as part of the local ecosystem, cycling nutrients that native plants have evolved to absorb. Dogs, on the other hand, eat processed, protein-dense food, and their waste carries a very different chemical and biological load. Rather than nourishing the land, it disrupts it. And unlike cow manure, which has been used as a fertilizer for millennia in agricultural settings, dog feces is not a natural fit for wild open spaces or trail ecosystems. Leaving it behind is not a neutral act.

The environmental damage begins with water. When dog waste is left on the ground, rain carries it untreated into storm drains and nearby waterways. The resulting bacterial load is dangerous for people who recreate in those waters, but equally harmful to aquatic life. It can fuel algal blooms that block sunlight and deplete the oxygen that fish depend on. On land, the high nitrogen content in dog feces leaches into the soil, altering its chemistry in ways that native plants cannot tolerate. The result is often the dieback of native grasses and wildflowers, and the spread of noxious weeds that thrive in nitrogen-rich conditions.

Perhaps the most alarming concern is what dog waste carries at a microscopic level. Dogs host a wide diversity of intestinal bacteria, and their feces can contain harmful parasites that pose risks not only to other dogs, but to children who play in affected areas and adults who spend time outdoors. Some of these parasites are remarkably persistent, remaining infectious in soil and water for years, long after the waste itself has disappeared from our view.

A bag and a trash can are all it takes to break this chain. Leaving dog waste bags on a trail or in a park is considered littering, so carrying it to the trash can is an important part of the process. On trails, in open spaces and at parks, that small effort makes an outsized difference for the health of the land, the water and the whole community that shares it.