What is sustainable pet food
Sustainable pet food balances animal nutrition with environmental limits, addressing how pet diets contribute to global emissions and land use.
Sustainable pet food is formulated to minimize environmental impact while meeting the strict nutritional needs of the animal, often by reducing reliance on high-impact ingredients like fish and beef, utilizing byproducts, or exploring alternative proteins like insects. This definition is complicated by the fact that "sustainable" is not a regulated term, meaning a label can imply eco-friendliness without guaranteeing it, and the most environmentally friendly food for the planet is not always the most appropriate for a specific pet's biology.
Environmental impact is the defining factor
Production of pet food is responsible for 20–30% of the environmental impacts from animal production, contributing significantly to climate change, land use, and water consumption. With an estimated 470 million pet dogs and 370 million pet cats globally, the carnivorous diets fed to these animals involve the consumption of roughly one-fifth of the world's meat and fish. Consequently, greenhouse gas emissions from dry dog and cat food alone represent between 1.1% and 2.9% of global emissions, a figure comparable to the total output of countries like Mozambique or the Philippines.
Ingredient selection drives the difference
Most meat used in pet food is a byproduct of the human food industry and is not considered "human grade," which is a baseline for sustainability but not a guarantee of it. A life-cycle analysis suggests that wet foods for cats and dogs generally have a larger environmental footprint than dry foods due to processing and water content. To improve sustainability, manufacturers are increasingly looking at alternative protein sources, including insects and algae, which require fewer resources than traditional livestock. While cats are obligate carnivores requiring nutrients like taurine found only in meat, research indicates they can digest plant proteins well, with absorption even increasing when half their protein intake is switched to a plant-based source.
Regulation and labeling are often misleading
There is no universal legal definition for "sustainable" on pet food labels, and terms like "premium," "ultra premium," and "holistic" currently have no official definitions. In the United States, the Association of American Feed Control Officials (AAFCO) sets standards that manufacturers follow, but AAFCO itself lacks regulatory authority and acts only as an advisory body. Critics argue that the "complete and balanced" label can be deceptive; studies suggest that while 100 foods may pass nutritional analysis, 10 to 20 might not be suitable for long-term use, and some lack maximum intake levels for certain nutrients. In the European Union, regulations are stricter regarding ingredient quality, requiring all ingredients to be fit for human consumption, yet by-products must still be labeled "Not for human consumption."
Health risks complicate the search for alternatives
While the raw feeding movement has grown alongside human trends toward natural products, veterinary associations warn against it due to risks of foodborne illness, zoonosis, and nutritional imbalances. There is no scientific evidence supporting the claimed health benefits of raw feeding, and some raw diets contain preservatives like sulfur dioxide (E220) that can destroy thiamine, leading to deficiency clusters in pets. Furthermore, feeding pets human leftovers poses significant dangers, as ingredients like chocolate, grapes, onions, and xylitol are toxic to dogs and cats, and cooked foods with sauces or gravies should be avoided.
Improvement lies in the entire lifecycle
True sustainability requires addressing all phases of the pet food life cycle, from formulation and ingredient selection to manufacturing processes and waste. While the market is dominated by five major companies, innovation is occurring in areas like reducing the carbon footprint of ingredients and ensuring that alternative proteins meet the specific biological needs of obligate carnivores like cats. Until standardized definitions for sustainability are widely adopted and enforced, the most reliable approach for a consumer is to look for products that prioritize high-quality byproducts, utilize plant-based proteins where appropriate, and adhere to rigorous safety standards like those of the AAFCO or FEDIAF.