How does pet food affect the environment
Dog food production drives 20–30% of animal agriculture's environmental impact, with dry kibble emitting 1.1–2.9% of global greenhouse gases.
Pet food production accounts for 20% to 30% of the environmental impact from all animal agriculture, with dry food for dogs and cats alone responsible for roughly 1.1% to 2.9% of global greenhouse gas emissions. This figure is comparable to the total annual emissions of entire nations like Mozambique or the Philippines, driven by the sheer scale of feeding 470 million pet dogs globally.
The carbon cost of feeding 470 million dogs
The environmental footprint is a direct result of the volume of food required to sustain the global pet population. As of 2018, there were approximately 470 million pet dogs, and their collective dietary needs generate a significant portion of the emissions associated with animal production. The carbon intensity of this sector is substantial enough that the emissions from pet food alone rival those of major economies, highlighting a massive, often overlooked, contributor to climate change.
Wet food carries a heavier load than dry
Life-cycle analyses indicate that wet food for cats and dogs generally has a larger environmental impact than dry food. This disparity exists primarily because wet food contains 60% to 90% water, whereas dry kibble contains only 6% to 10% moisture. Transporting and processing large quantities of water requires significantly more energy and resources than moving dry ingredients. Consequently, a larger volume of wet food must be manufactured and shipped to meet a dog's nutritional requirements, amplifying the carbon cost per calorie delivered.
Ingredients and manufacturing drive the footprint
The environmental impact is also dictated by the specific ingredients used and the energy-intensive manufacturing processes required to make them palatable. Most commercial dog food relies on animal feed-grade ingredients, including meat and bone meal, offal, and animal by-products, often derived from maize and poultry. The extrusion process used to create dry kibble requires heating the mixture above 150 degrees Celsius using steam or hot water to achieve the necessary fluidity. This high-heat, high-pressure process is energy-intensive and can denature certain nutrients, necessitating artificial supplementation later in production.
Formulation and processing inefficiencies
Current manufacturing methods often prioritize cost and shelf stability over nutritional efficiency, leading to further resource use. The extrusion process, while efficient for continuous production, can degrade sensitive nutrients like taurine, which must then be artificially added back into the diet. Furthermore, the use of rendered meat sources and grain fillers in lower-cost formulations suggests a reliance on by-products that still require significant agricultural input to generate. While research into alternative protein sources like insects and algae is underway, the current industry standard remains heavily dependent on traditional animal and grain agriculture.
Opportunities for reduction
There are substantial opportunities to reduce the environmental impact across all phases of the pet food life cycle, from ingredient selection to manufacturing. Improvements could focus on optimizing formulation to reduce waste, selecting lower-impact protein sources, and refining manufacturing processes to lower energy consumption. Until these changes become standard, the choice between wet and dry food remains one of the most direct ways an owner can influence their pet's environmental footprint, with dry food currently offering a lower-carbon option.