Build a supplement stack your dog actually needs.
20 supplements scored on 6 metrics. Weight-based dosing. Vet-reviewed protocols. Tell us about your dog and get a personalized, evidence-rated stack in 60 seconds , no email required.
Tell us about your dog. Get an evidence-rated stack in 60 seconds.
20 supplements indexed. 7 health goals. Weight-based dosing. The output is a printable protocol your vet can review.
Start the builder →What does your dog actually need?
Best joint supplements for dogs
Glucosamine, chondroitin, MSM, and green-lipped mussel: which combinations actually reduce stiffness in seniors and large breeds.
Best probiotics for dogs
CFU counts, strain diversity, and which probiotics actually survive stomach acid to colonize the gut where it matters.
Best fish oil for dogs
EPA/DHA ratios, third-party purity testing, and why most pet fish oils are underdosed compared to clinical research.
Best calming supplements for dogs
L-theanine, melatonin, hemp, and what the controlled research actually says about reducing anxiety in dogs.
Senior dog stack: joint, brain, immune
The 5 supplements every senior needs (glucosamine, omega-3, CoQ10, probiotics, SAMe) with dosing by body weight.
Best vitamins for dogs
Which vitamins your dog actually needs, which are overkill or harmful, and the best products for each life stage.
Six metrics, equal weight, no exceptions.
Most "best supplement" lists are rewritten Amazon descriptions. We score every product on the same six metrics, weight them equally on a 10-point scale, and publish what failed alongside what won.
Read the full methodology →Recent tested-and-ranked guides
Best dog supplements in 2026: 15 brands tested & ranked across 6 metrics
We bought, tested, and scored every major dog supplement brand on the same six metrics. Here’s what actually works, what’s overpriced marketing, and what to skip entirely.
Best supplements for senior dogs (7+)
The 5 supplements every senior dog needs, with weight-based dosing.
Best vitamins for dogs (2026)
Which vitamins your dog actually needs and which are overkill.
Sourced from regulatory and peer-reviewed primaries.
Every roundup, dosing recommendation, and ingredient claim on PetMaxxing is cross-cited from primary regulatory or peer-reviewed veterinary sources before publication. We do not name a credentialed reviewer on any article unless that person is a contracted advisor whose review log we publish in full.