Changing Your Dog's Diet Saves the Planet Better than Yours

Switching a dog to a sustainable, plant-based diet may reduce a household's environmental footprint more effectively than a human family member going vegan, according to a new study that highlights the ironic oversight in global climate and animal welfare advocacy.

The research, published this week in the journal, Animals, suggests that because canine diets are often more heavily reliant on animal proteins than human diets, the ecological stakes of what goes into the dog bowl are disproportionately high.

"It’s ironic that the animal advocacy movement has largely overlooked the diets of its own companion animals," said Andrew Knight, a veterinary Professor and the study’s lead author.

Prof. Knight's meat math findings reveal that an average dog consumes approximately 13 farmed land animals per year, compared to an average of nine for humans, a difference of roughly 40%.

The gap is driven by dietary density which animal-based ingredients account for about 34% of a typical dog’s caloric intake, nearly double the 19% global average for people.

While these figures fluctuate by region, in the United States of America, humans actually edge out their pets by consuming 24 animals annually to a dog’s 20, the collective impact remains staggering.

The Sustainable Pet Food Foundation, which released the findings, noted that the pet food industry has traditionally been a neglected sector in the fight against climate change.

The study estimates that if every domestic dog transitioned to a nutritionally sound vegan diet, the environmental dividend would include six billion land animals spared from slaughter annually.

Greenhouse gas equivalent to 1.5 times the United Kingdom’s total annual emissions would be saved and enough conserved food energy to feed 450 million people, roughly the population of the European Union.

The shift toward "cultivated meat" and microbial proteins in pet food comes amid growing evidence that traditional meat isn’t a biological necessity for domestic canines.

As of early 2026, 14 studies have reported positive health outcomes for pets on meat-free diets, provided they are professionally formulated.

"Plant-based pet diets represent a powerful but overlooked way to reduce farmed animal use, improve food security, and address climate and biodiversity challenges," Prof. Knight said.

Experts however caution that owners should not attempt "do-it-yourself" vegan diets for pets.

To ensure health, these diets must be produced by responsible manufacturers and supplemented with essential synthetic nutrients that mimic those found in meat.

Despite the potential impact, the study found the sector is starved for attention.

Currently, only about two full-time researchers globally work on sustainable pet food outside of the private sector, and less than 1% of farmed animal advocacy budgets are directed toward pet nutrition.

Knight’s analysis of survey data suggests that at least 150 million dogs and cats could be transitioned to these diets immediately, a number he calls a conservative estimate.

As dog populations continue to outpace human growth in several developed nations, the study concludes that the path to a cooler planet may very well be paved with kibble, not just kale.