Key Takeaways The claim “postbiotics are just deactivated probiotics” is a category error: postbiotics are defined by their bioactive metabolite content, not by whether live cells are present. International scientific consensus (ISAPP 2021) explicitly distinguishes postbiotics from heat-inactivated or non-viable probiotics based on mechanism, not nomenclature. Short-chain fatty acid (SCFA) production in canine trials —…

Key Takeaways AAFCO and FDA labeling rules do not define a standard unit for postbiotic metabolites, so manufacturers self-report content. Common label metrics — CFU-equivalents, “postbiotic blend (mg),” and “metabolite activity units” — are not interchangeable and not independently verified. Buyers can ask three evidence-based questions to evaluate a postbiotic label before purchase. Published canine…

Key Takeaways “Postbiotics work faster than probiotics” is a claim that conflates mechanism with measurable outcome — onset-of-effect claims must be evaluated against actual trial endpoints and measurement windows. PMID 40509062 measured dental plaque outcomes at a 30-day endpoint in dogs; no earlier timepoints were reported, so claims of “faster” onset from this specific trial…

Key Takeaways The claim that dogs need daily probiotics “like humans do” misapplies human dosing logic to a fundamentally different gastrointestinal physiology. Canine pharmacokinetic data on probiotic persistence is limited, but available trials show most administered strains transit within 48–72 hours of cessation. Postbiotic formulations sidestep the daily-dosing question entirely because they deliver inactivated bacterial…

Key Takeaways The FDA’s 2018–2022 grain-free/DCM investigation identified a statistical association but did not establish a causal mechanism. Peer-reviewed studies published after the FDA’s 2022 update found no consistent link between grain-free diets and cardiac changes in healthy dogs. The hypothesized diet-microbiome-beatinine axis remains unproven; existing canine microbiome studies on grain-free diets are small and…

Key Takeaways “Guaranteed Analysis” on a dog supplement label is a manufacturer self-declaration of minimum nutrient levels — not an independent laboratory certification of potency or efficacy. AAFCO’s Guaranteed Analysis rules apply to complete and balanced pet foods, not to most supplements, leaving a regulatory gray zone that many brands exploit. Probiotic CFU counts listed…