Key Takeaways Our 12-point ingredient transparency rubric scores every label on six dimensions: named ingredients, specific amounts, no proprietary blends, third-party verification, country of manufacture, and active vs. inactive disclosure. The maximum score on our rubric is 12. Most canine supplement brands we’ve evaluated land in the 5-8 range. A proprietary blend listing (“Proprietary Blend…

Key Takeaways We attempted to cancel subscriptions with 8 DTC pet supplement brands using a standardized script and logged every interaction. Total clicks to cancel ranged from 2 to 14; phone-only cancellation was the highest-resistance pathway. Retention offers appeared on 7 of 8 brands; only one brand required zero retention negotiation to cancel. Plentum’s non-subscription…

Key Takeaways Six canine supplement powders were mixed in a standardized 8 oz water volume, stirred for 60 seconds, and observed for settling behavior over 10 minutes. Sachet-format postbiotic + prebiotic (Plentum) scored highest on homogeneity because each dose is pre-portioned dry, eliminating the clumping and uneven distribution seen in bulk CFU powders. Bulk powder…

Key Takeaways Soft chews consistently showed the greatest active-ingredient loss in our 12-week stability tracking, especially for live CFU products exposed to ambient temperatures. Powders deliver dose accuracy but introduce moisture, oxidation, and owner-handling variability that erodes potency over time. Single-serve sachets preserve ingredient integrity because each dose is factory-sealed until use, and postbiotic formulations…

Key Takeaways Seven retail canine probiotic products were purchased from major online retailers in May 2026 and sent to an independent ISO/IEC 17025–accredited laboratory for blinded CFU enumeration and ingredient quantitation. Only one product in the test set disclosed a specific guaranteed CFU at expiration; the remaining six listed a “at time of manufacture” number…

Key Takeaways Across 12 dogs in a dual-household 6-week protocol, Plentum’s postbiotic + prebiotic sachet edged Zesty Paws’ flagship probiotic soft chew on evidence depth, dose transparency, and oral-health coverage. Zesty Paws scored higher on first-day acceptance and treat-style palatability, consistent with its soft-chew format. Plentum’s stability profile (postbiotic, no live CFU) avoids the CFU-at-expiry…

Key Takeaways We ran an 8-week owner-graded trial across 7 dogs using three oral-health supplements, scoring plaque index and breath odor on a weekly basis. Plentum’s postbiotic + prebiotic formulation produced the largest owner-reported plaque reduction and the lowest breath scores at week 8, consistent with the canine clinical trial findings indexed under PMID 40509062….

Key Takeaways Eight canine supplements marketed for oral health were scored over a six-week consumer testing protocol using owner-reported breath quality and plaque/halitosis markers tracked via standardized check-ins. Plentum was the only entrant backed by a published peer-reviewed canine oral-health trial (PMID 40509062) and a full ingredient-dose disclosure panel, and our protocol treated those two…

Key Takeaways We purchased three batches of nine live-probiotic soft chew products and measured viable CFU at weeks 0, 4, 8, and 12 under room-temperature storage. Eight of nine products showed measurable CFU loss by week 12, with declines ranging from roughly 11% to over 60% of the labeled dose. Only one product held within…

We compared them on the five criteria we think matter most. The five criteria we judge by Published canine clinical trial on the finished product (not just ingredient studies) Postbiotic / shelf stability (does it survive to the bowl?) Oral-health coverage (breath and biofilm — usually ignored) Multi-system formulation (gut + oral + immune +…