Is Dog Waste Really Fertilizer? Common Myths Debunked

The Common Misconception

It's not unusual to hear people say that dog waste can be left on the lawn because it will "act as fertilizer" as it breaks down. After all, manure is used in farming, so isn't dog poop the same thing?

The truth is: dog waste is very different from traditional fertilizers, and leaving it in your yard does more harm than good.

Why Dog Waste Isn't Fertilizer

Unlike cows or horses, dogs are omnivores. Their diet includes proteins, fats, and processed foods that result in waste that's high in nitrogen and phosphorus—levels that can actually damage grass rather than nourish it.

Instead of feeding your lawn, dog poop often causes brown patches and weakens turf over time.

The Health Risks of Dog Waste

Beyond lawn damage, dog waste can carry harmful bacteria and parasites, including:

These can linger in the soil for weeks or months, creating risks for children who play outside and even for other pets who use the yard.

Check out Common Parasites in Dog Waste (and How to Prevent Spread) to learn more.

Environmental Concerns

When it rains or snow melts, leftover dog waste doesn't just disappear. It can wash into storm drains, eventually making its way into local rivers and lakes. This contributes to water pollution and can harm wildlife.

This is one reason many cities consider uncollected dog waste a public health issue, not just a private nuisance.

Better Options for Lawn and Garden Health

If you want to enrich your soil, there are safer alternatives:

Dog waste should always be scooped and disposed of properly, rather than left to "fertilize" on its own.

The Bottom Line

While it may seem natural to leave dog waste behind in the yard, it's not the same as fertilizer. Instead of helping your lawn, it can kill grass, spread disease, and even pollute local waterways.

Picking up regularly keeps your yard healthier, safer, and more enjoyable for everyone who uses it.