Veterinary Professor of Animal Welfare Andrew Knight believes that vegan diets can be safe for companion animals, including cats. While it has been widely acknowledged that plant-based diets are suitable for dogs, very few sources recognize that the same can be true for cats. Knight refutes the British Veterinary Association's claim that it is impossible to create a complete vegan diet for cats, citing recent scientific evidence that shows properly formulated vegan diets can meet their nutritional needs.

Feeding companion animals animal-based foods has a significant environmental impact, with cats and dogs contributing 25 to 30 percent of the meat industry's total greenhouse gas emissions. Knight's research suggests that transitioning the world's dogs to plant-based diets could save billions of tons of CO2 emissions per year and free up a large area of land from animal farming. He calls for a shift towards sustainable, plant-based diets to combat climate change and reduce environmental damage caused by animal agriculture, emphasizing the urgent need for action in the face of the worsening climate crisis.