Plant-based pet diets gain traction, but questions remain

Plant-based pet food is no longer just a fringe talking point. A May 4, 2026, Pet Age feature found brands in the space are talking like the category is here for the long haul, framing plant-based formulas around sustainability, wellness, ingredient innovation, and growing pet parent demand, particularly for dogs. The timing matters: consumer curiosity appears to be rising in parallel, with PetfoodIndustry reporting on October 9, 2026, that U.S. users accounted for 65% of vegan dog diet inquiries on the pet care platform Dosty during a recent three-month window. (petage.com)

That momentum reflects a broader spillover from human food culture into companion animal nutrition. Pet Age described plant-based eating as already established in human grocery aisles and increasingly showing up in pet products as sustainability and wellness shape buying decisions. But the category’s growth has also been constrained by a long-running veterinary question: can these diets deliver adequate nutrition, digestibility, and long-term health outcomes, especially across species with very different nutritional needs? (petage.com)

On the evidence front, the newest research adds nuance rather than closure. In a 2026 review published in Animals, Andrew Knight analyzed 31 studies and concluded that modern vegan and vegetarian pet diets, and their main protein sources, were broadly well digested by dogs and cats when properly designed and manufactured. The review reported high apparent total tract digestibility values across the studies it assessed. Still, the paper also noted that digestibility is only one determinant of nutritional adequacy, not the whole story. (pmc.ncbi.nlm.nih.gov)

Regulatory and practical guardrails remain important. AAFCO’s consumer guidance says pet foods should be species-specific, complete, and balanced for the intended life stage, and notes that cats require nutrients dogs do not, including taurine and preformed vitamin A. That’s especially relevant because much of the commercial and advocacy energy around plant-based feeding is centered on dogs, not cats. The ASPCA, for example, says plant-based diets are not suitable for cats, while suggesting plant-based foods and treats may be an option for dogs with veterinary guidance. (aafco.org)

Industry messaging is also evolving beyond simple plant substitution. Pet Age highlighted brand arguments that education, transparency, and veterinary credibility will determine whether the category expands. PawCo said brands need to explain how foods meet nutritional standards, share third-party testing or feeding-trial information, and make the science approachable. That emphasis on proof points may become more important as consumers sort through a mix of conventional plant-based products, hybrid approaches, and new ingredients made through precision fermentation. (petage.com)

One sign of that next phase is regulatory movement on alternative proteins. In 2026, Bond Pet Foods and Hill’s Pet Nutrition announced that the FDA had issued a no-objection letter tied to Bond’s lamb protein yeast for use in adult dog food, with the ingredient positioned as the first animal protein produced via precision fermentation to complete that review pathway for pet food. FDA’s current animal food GRAS inventory also lists Bond Pet Foods among notices on file, underscoring that the alternative-protein conversation in pet food now includes both plant-based formulations and animal-free biotech ingredients. (prnewswire.com)

Why it matters: For veterinary teams, this is becoming less of a hypothetical and more of a client communication issue. Interest appears strongest on the dog side, especially in the U.S., but consumer motivation may range from ethics and sustainability to allergy concerns and perceived wellness benefits. Clinics will likely need a consistent framework: confirm whether a product is complete and balanced, verify the intended species and life stage, review the manufacturer’s quality-control and feeding-trial data, and monitor individual patients over time. The evidence base is growing, but it still doesn’t erase species differences or the risks of poorly formulated diets, particularly for cats. (petfoodindustry.com)

What to watch: The next signal will be whether consumer curiosity converts into sustained purchasing and broader veterinary acceptance, or remains concentrated among a values-driven subset of dog-feeding pet parents. Watch for more feeding-trial data, more explicit veterinary nutrition guidance, and additional regulatory milestones for precision-fermented ingredients over the next 12 to 18 months. (petfoodindustry.com)