Feeding the family dog looks like a small, everyday gesture. Yet researchers now say what lands in that bowl carries a measurable weight on the climate, right up there with other sectors we usually blame first.
The hidden climate bill in your dog’s bowl
France offers a useful snapshot: nearly a third of households there live with a dog, and over 80% rely on industrial pet food such as kibble, tinned food or fresh prepared meals. The UK and US show similar trends, with pet aisles expanding in every supermarket.
That love comes at a financial cost. In France, owners spend around €485 a year on dog food alone. In the UK and US, annual spending can be even higher for premium brands. But the new research from the University of Edinburgh and the University of Exeter focuses on a different price tag altogether: greenhouse gas emissions.
According to the study, producing ingredients for dog food in the UK accounts for roughly 1% of the country’s total greenhouse gas emissions.
That might sound small, until you set it against other sectors. Researchers estimate that feeding all the world’s dogs generates emissions comparable to more than half the CO₂ released every year from burning aviation kerosene in commercial jets.
For an industry that rarely appears in climate debates, this is a wake-up call. Pet food, long presented as a way to “valorise” meat by-products, can at times compete directly with humans for the same high‑quality cuts of meat.
Why some dog foods are up to 65 times worse for the climate
The study, published in the Journal of Cleaner Production, reveals a huge spread in climate impact between different types of dog food sold on the UK market.
Some recipes have a carbon footprint 65 times higher than others, largely because of the kind of meat they contain.
At one end of the scale are products made with large quantities of “prime” meat: chicken breast, beef steak, or other cuts usually eaten by humans. When dog food brands use those, they effectively add extra pressure on farming systems that are already land- and carbon-intensive.
➡️ A rare polar vortex shift is taking shape and experts warn March could be extreme this winter ahead
➡️ A tiny red dot in deep space may be a new kind of cosmic monster
➡️ Designing AI Workplaces That Support Early Career Growth
➡️ Psychologists say people who intellectualize emotions do so to stay emotionally safe
➡️ No bleach or ammonia needed: the simple painter approved method to eliminate damp at home for good
➡️ This is why your fridge fills up so fast, and how to prevent it
At the other end are products based mainly on nutritious parts of the carcass that humans in wealthy countries tend to ignore: organs, trimmings, connective tissue. These are not “waste” in a nutritional sense; they are rich in protein and micronutrients, but socially downgraded.
In general, classic dry kibble made from those by-products shows a lower climate impact than wet food, grain‑free ranges or raw meat diets that lean heavily on prime cuts.
Kibble, wet, raw: how the climate impacts compare
While numbers vary by brand, the research and industry data point to broad trends:
- Traditional dry kibble: often relies on rendered meat by‑products, cereals and plant proteins; tends to have the lowest emissions per kilogram of food.
- Wet canned or pouch foods: heavier, often higher in meat content and water; emissions per meal can be higher, especially with human‑grade meat.
- Raw and “human‑grade” diets: frequently use high‑value meat cuts; can sit among the highest emitters, particularly when ingredients could be eaten by humans.
- Grain‑free products: not automatically greener; often replace cereals with more meat or high‑impact ingredients like certain pulses.
None of this tells you whether a product is healthy for an individual dog. It does show that, from a climate angle, ingredient sourcing and meat type matter far more than packaging or marketing buzzwords.
How meat for dogs overlaps with meat for humans
One key question is whether dog food “uses up” meat that humans would otherwise eat, or whether it genuinely turns leftovers into something useful. In practice, both scenarios exist side by side.
Many mid‑range kibbles and economy tins rely on rendered by‑products: heads, bones, organs and trimmings. These pieces are less marketable to human consumers in Europe or North America, even though they remain common food in other parts of the world.
Premium brands aimed at affluent owners increasingly highlight “human‑grade” fillets and recognisable cuts on their packaging. This is where climate impact rises sharply. Farmers must raise more animals, or push production harder, to satisfy this parallel appetite for top‑tier meat.
When pet food shifts from using by‑products to sharing the same steak as its owner, its carbon footprint starts to resemble that of another meat‑eating person.
That shift also has land‑use implications. More livestock means more pasture, more feed crops like soy and maize, and in some regions, more pressure on forests and savannahs.
Choices owners can make without short‑changing their dog
The researchers stress that dog owners are not powerless. Climate impact is far from fixed; it depends heavily on everyday choices.
Opting for standard dry kibble instead of grain‑free, wet or raw meat diets can significantly cut a dog’s food‑related emissions.
For owners concerned about both health and climate, veterinary advice remains crucial. The worst outcome would be an undernourished animal. Yet within the range of nutritionally complete options, some patterns stand out:
- Look for foods based on meat by‑products or “meat meal” rather than human‑grade steaks and fillets.
- Be cautious with grain‑free marketing claims unless your vet has diagnosed a genuine intolerance.
- Buy appropriate portion sizes; obesity in dogs increases food demand and has its own health footprint.
- Avoid overfeeding treats made from resource‑heavy meat, especially beef and lamb.
The research team also calls on the pet food industry to adjust course. They argue companies should prioritise animal parts not destined for human plates and set clear labelling rules so buyers know what they’re paying for in climate terms, not just in taste and convenience.
A quick guide to key climate terms
| Term | What it means for your dog’s food |
|---|---|
| Carbon dioxide (CO₂) | The main greenhouse gas released when fossil fuels are burned to grow, process and transport ingredients. |
| Greenhouse gases | A group of gases, including CO₂ and methane, that trap heat in the atmosphere and drive global warming. |
| Carbon footprint | The total amount of greenhouse gases emitted along the life cycle of a product, from farm to food bowl. |
| Life‑cycle analysis | A method researchers use to measure the environmental impact of a product at each stage of production. |
Future menus: insects, lab meat and plant‑based diets
The study on UK dog food joins a growing body of work asking how pets might fit into lower‑carbon lifestyles. Several options are already being tested in shops and start‑ups.
Insect‑based dog foods, made from farmed black soldier fly larvae or mealworms, can offer high protein with a lower land and water footprint than beef or lamb. They still need robust nutritional trials, but early data suggest many dogs tolerate them well.
Cultivated meat – grown from animal cells in bioreactors – is also being positioned for pet food, where consumer squeamishness might be lower than for human plates. If powered by low‑carbon energy, this could, at scale, cut emissions and reduce the need for intensive livestock farming.
Plant‑based dog diets remain controversial. Some studies suggest that well‑formulated vegan dog food can keep healthy adult animals in good condition. Many vets remain cautious, pointing to the risk of deficiencies if diets are not carefully balanced and monitored. Climate‑conscious owners tempted by this route should seek professional guidance and regular health checks.
What happens if every dog “goes green”?
Imagine a large European country where half of all dog owners switch from high‑meat wet food to lower‑impact kibble made mainly from by‑products and plant protein. Based on current estimates, national emissions from dog food could fall by hundreds of thousands of tonnes of CO₂‑equivalent per year.
That reduction will not solve climate change on its own, but it would sit alongside similar cuts from diet shifts in humans, building efficiency, transport changes and cleaner energy. Together, they reshape the baseline of everyday emissions.
There are trade‑offs to watch. If human diets also reduce meat consumption, some of the “by‑products” used by pet food could disappear because fewer animals are slaughtered overall. That could push the industry to rethink ingredients again, perhaps towards insects, algae or more plant‑based formulations.
For city councils and policymakers, pet food is starting to appear in broader climate plans, alongside waste, transport and housing. As data improves, they may encourage clearer eco‑labelling on pet products or support research into alternative ingredients that keep both animals and the climate in reasonable shape.
For now, one thing is clear: that clattering bowl on the kitchen floor is part of the climate story. Each time we fill it, we make a small decision about the kind of food system, and the kind of planet, we want our dogs to grow old on.