I have always assumed that biodegradable dog waste bags were a good thing. After all, “biodegradable” sounds environmentally friendly. But recently I began wondering what that term actually means.
If a biodegradable bag were accidentally dropped on the ground, would it simply disappear? Would it become part of the soil? And is biodegradable the same thing as compostable?
As it turns out, the answers are more complicated than I expected.
What Does “Biodegradable” Actually Mean?
The word sounds reassuring. Something that biodegrades breaks down naturally — returned to the earth, no harm done. That’s the image the word conjures, and it’s the image many manufacturers are counting on.
But “biodegradable” is largely an unregulated term in Canada. There is no standard that a product must meet before it can carry that label. A bag can call itself biodegradable if it breaks down eventually — and “eventually” can mean anywhere from a few months to several decades, depending on conditions.
More troubling, many so-called biodegradable bags are made from conventional plastic blended with additives that cause them to fragment more quickly. They don’t return to the earth — they break into smaller and smaller pieces of plastic, which can be harder to clean up and potentially more damaging to soil and waterways than the original bag.
So if you dropped a biodegradable bag on a trail, would it simply disappear? Not likely. It would sit there, slowly breaking apart — but breaking apart into plastic, not into soil.
Not to mention that it would desecrate the environment for everyone who passes by.
Biodegradable vs. Compostable — They Are Not the Same Thing
This is where it gets important.
Compostable bags meet a much stricter standard. A certified compostable bag is designed to break down completely — into water, carbon dioxide, and organic matter — within a specific timeframe and under specific conditions. It leaves no toxic residue behind.
The catch? Those conditions matter enormously. Most certified compostable bags are designed for industrial composting facilities, where temperatures, humidity, and microbial activity are carefully controlled. In a backyard compost bin — and especially just dropped on the ground — a compostable bag may take just as long to break down as a regular one, because the right conditions simply aren’t there.
And it’s worth noting — even certified compostable bags should not go into your regular green bin with dog waste in most Canadian municipalities. Dog waste carries pathogens that most home composting systems can’t safely process. Always check your local guidelines.
What Happens in a Landfill?
Here is the part that surprised me most.
In a landfill, almost nothing biodegrades properly — regardless of what it’s made from. Landfills are engineered to be dry, compacted, and sealed. That means very little oxygen, very little moisture, and very little microbial activity. The three things biodegradation needs are simply not present.
According to research by the University of Arizona’s Garbage Project, 25-year-old newspapers have been found in landfills, still perfectly legible. Fruits and vegetables that should decompose in weeks have been excavated intact after years underground. In a landfill, a biodegradable dog waste bag behaves almost identically to a conventional plastic bag. It just sits there.
So, does that mean biodegradable bags are no better than regular plastic? In a landfill context — honestly, barely. The meaningful difference only appears if a bag escapes the waste stream. A bag dropped on a hiking trail, blown out of a bin, or washed into a waterway may break down faster if it’s truly biodegradable, causing less long-term harm to wildlife and the environment.
That’s a real benefit — but it’s a small consolation for what amounts to littering.
So What Actually Matters?
The bag is almost never the most important environmental choice you make on a walk.
Proper disposal is. A regular plastic bag, properly tied and placed in a waste bin, is far better for the environment than a biodegradable bag left on a trail — or worse, tossed into the woods with the assumption that nature will take care of it. It won’t. Not for a very long time.
If you want to make a genuinely better choice, look for bags that are certified compostable (look for the Compost Manufacturing Alliance or BPI certification) and check whether your municipality accepts them for organic waste collection. Some do. That’s where composting can actually work as intended — at scale, with proper conditions.
But do you really want to put your dog’s waste in with your kitchen scraps?
And if certified compostable isn’t available or practical for you, a well-made, reliable bag that you actually use consistently — and dispose of properly every single time — is doing far more good than any label on the packaging.
Practical tips and honest suggestions — that’s what DoggiePooBags.com is here for. No sales pitch, just the information you actually need.
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