Looking for the best pet supplements? Our team ranked the top 10 by real customer review volume (27,316 reviews in total), led by Pets, Omega-3 Support for Dogs/Cats, Great Fish, 180 Softgels, 8.7 oz (247 g).
How we rank it: Pets, Omega-3 Support for Dogs/Cats, Great Fish, 180 Softgels, 8.7 oz (247 g) takes our top spot: it's the standout pet supplements in this guide, earning the lead for its easily-absorbed form.
How we rank it: We placed Pets, L-Lysine for Cats, 8 oz (226.8 g) at #2 thanks to its strong balance of quality and price.
How we rank it: At #3, Senior Multi Daily Formula, Senior Dog, Liver, 60 Chewables earns its spot for how consistently shoppers reach for it.
How we rank it: At #4, Omega-3 Pet™, For Dogs, 90 Soft Gels earns its spot for how consistently shoppers reach for it.
How we rank it: At #5, Omega-3 Pet™, For Dogs, 180 Soft Gels earns its spot for how consistently shoppers reach for it.
How we rank it: Omega-3 Pet™, For Dogs , 8 fl oz (237 ml) lands at #6 largely for Nordic Naturals's reputation for quality.
How we rank it: We placed Omega-3 Pet™, For Dogs, 16 fl oz (473 ml) at #7 thanks to its strong balance of quality and price.
How we rank it: We placed LactoBif® Pet Probiotics, 5 Billion CFU, 60 Veggie Capsules at #8 thanks to its strong balance of quality and price.
How we rank it: Hairball, For Cats, All Sizes, 30 Chews, 1.59 oz (45 g) lands at #9 largely for how consistently shoppers reach for it.
How we rank it: We placed Hairball, For Cats, All Sizes, 160 Chews, 8.47 oz (240 g) at #10 thanks to its strong balance of quality and price.
| # | Product | Brand | Score | Rating | Reviews | Price | |
|---|---|---|---|---|---|---|---|
| 1 | Pets, Omega-3 Support for Dogs/Cats, Great Fish, 180 Softgels, 8.7 oz (247 g) | NOW Foods | 9.3 | 4.6 | 2,210 | $14.69 | View → |
| 2 | Pets, L-Lysine for Cats, 8 oz (226.8 g) | NOW Foods | 9.3 | 4.6 | 1,599 | $10.40 | View → |
| 3 | Senior Multi Daily Formula, Senior Dog, Liver, 60 Chewables | petnc NATURAL CARE | 9.5 | 4.7 | 1,460 | $7.99 | View → |
| 4 | Omega-3 Pet™, For Dogs, 90 Soft Gels | Nordic Naturals | 9.7 | 4.8 | 1,196 | $19.51 | View → |
| 5 | Omega-3 Pet™, For Dogs, 180 Soft Gels | Nordic Naturals | 9.7 | 4.8 | 1,195 | $35.66 | View → |
| 6 | Omega-3 Pet™, For Dogs , 8 fl oz (237 ml) | Nordic Naturals | 9.5 | 4.7 | 1,032 | $22.91 | View → |
| 7 | Omega-3 Pet™, For Dogs, 16 fl oz (473 ml) | Nordic Naturals | 9.5 | 4.7 | 1,032 | $39.91 | View → |
| 8 | LactoBif® Pet Probiotics, 5 Billion CFU, 60 Veggie Capsules | California Gold Nutrition | 9.5 | 4.7 | 8,874 | $11.16 | View → |
| 9 | Hairball, For Cats, All Sizes, 30 Chews, 1.59 oz (45 g) | Pet Naturals | 8.9 | 4.4 | 4,359 | $7.50 | View → |
| 10 | Hairball, For Cats, All Sizes, 160 Chews, 8.47 oz (240 g) | Pet Naturals | 8.9 | 4.4 | 4,359 | $17.43 | View → |
Our editorial team evaluates every product on the factors that matter most to shoppers, not just price.
We rank by verified customer reviews and rating. For added assurance, we recommend choosing products that carry independent third-party testing or certification. These organisations publish public standards and verified-product listings:
This guide is for general information only and is not medical advice. Consult a qualified professional before starting any supplement.
Pets, Omega-3 Support for Dogs/Cats, Great Fish, 180 Softgels, 8.7 oz (247 g) leads with 2,210 verified reviews, followed by Pets, L-Lysine for Cats, 8 oz (226.8 g) with 1,599.
Hairball, For Cats, All Sizes, 30 Chews, 1.59 oz (45 g) is the lowest-priced pick at $7.50, with a 4.4/5 rating from 4,359 reviews.
We rank pet supplements primarily by their number of verified customer reviews, a strong signal of real-world popularity, and factor in average rating. We never accept payment for placement.
This guide compares 10 of the most-reviewed pet supplements available, ranked from most to least reviewed.
The products in this comparison were in stock at our last update (2026-10-27). Availability can change, so check the product page for current status.