Premium Pick
Seresto Flea & Tick Collar for Large Dogs
by Seresto (Bayer/Elanco) · ASIN B00B8CG602
The best-known non-prescription flea and tick collar on the market, offering 8 months of continuous protection for large dogs.
$59.92
Price on Amazon as of 2026-09-15 — prices and availability may change.
8.3/10
Our editorial scoreIndependent of Amazon's rating — see Methodology
Editor's Take
Seresto's headline feature is duration: 8 months of continuous flea and tick protection from a single collar, versus the monthly reapplication most topical treatments require. With nearly 27,000 ratings averaging 4.4/5 on the large-dog variant, it's also one of the most-reviewed flea/tick products sold online.
It sits at the premium end of the flea/tick category on a per-month basis, but for owners who want to "set and forget" for most of the year, the convenience is the main selling point.
Check Price on AmazonOur Scorecard
Efficacy9/10
Duration10/10
Safety Profile8/10
Water Resistance8/10
Ease of Application9/10
Value6/10
Full Specifications
| Protection Months | 8 |
|---|---|
| Weight Range | Over 18 lbs |
| Min Age Weeks | 7 |
| Active Ingredients | Imidacloprid 10.0%, Flumethrin 4.5% |
| Water Resistant | True |
| Prescription Required | False |
| Collar Length In | 27.5 |
| Verification note | The amazon.com/dp/B00B8CG602 link redirected inconsistently during verification (it resolved cleanly on Amazon.sg in one check). Confirm this exact link resolves to the correct US 'over 18 lbs' Seresto listing on Amazon.com before publishing — if not, Claude can swap it for the correct ASIN. |
Pros
- 8 months of continuous protection per collar
- No monthly reapplication needed
- Water-resistant after bathing/swimming (monthly max)
- No prescription required
Cons
- Higher upfront cost than monthly topical treatments
- Some pet parents report sensitivity — introduce gradually and monitor
Best for: Owners who want low-maintenance, long-duration flea/tick protection for a dog over 18 lbs.
Who should avoid it: Owners of dogs under 18 lbs (a separate Seresto variant exists for smaller dogs) or anyone preferring monthly vet-directed treatments.
What Reviewers Say
Reviewers most often cite the 8-month duration and convenience; a minority report skin sensitivity, which is consistent with any topical/contact flea treatment and worth monitoring in the first days of use.
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