Seresto 8-Month Flea & Tick Collar
The owner who forgets monthly doses — a collar the maker states kills and repels fleas for eight continuous months
Seresto Large Dog Vet-Recommended Flea & Tick Treatment & Prevention Collar for Dogs Over 18 lbs. | 2-Pack
This is something you buy again. We have not worked out a verified monthly cost for this one yet, and would rather say so than divide a pack price by a guess.
The variant we link: 18 lbs · 2-PackOne Amazon page often holds several sizes; check the selected option before you buy.
Amazon links earn us a commission; it doesn’t change what we recommend. Researched, not tested — how we research.
Price checked November 1, 2026; the listing has today's price.
Most owners add · Grooming & Nails
Brushing is the check: it is how a tick gets found before it has been attached a day.
Suits these stages
Is the Seresto 8-Month Flea & Tick Collar, Dogs Over 18 lb (2-pack) right for your dog?
- Who it’s for
- The owner who forgets monthly doses — a collar the maker states kills and repels fleas for eight continuous months.
- Who should skip it
- Your dog is under 18 lb — this is the large-dog band — or your vet has recommended an oral preventive instead.
The verdict
Consistency is what actually protects a dog, and a collar removes the main failure mode: forgetting. Seresto state eight months of continuous flea protection from a single collar for dogs over 18 pounds, that it begins working within 24 hours, that it kills and repels by contact so parasites do not have to bite, and that it is waterproof — the last point mattering for dogs who swim, since it is the usual weakness of the format. Non-greasy, with nothing to apply monthly. This is the two-pack, which covers sixteen months. It is among the most-reviewed parasite products on the market. As with everything in this category, the choice between a collar, a spot-on and a vet-prescribed oral is a conversation with your vet, based on your region and your dog — not a rating.
Drawbacks
- Weight-banded: this is the over-18 lb version only
- High upfront cost compared with a single spot-on dose
WagScore
80out of 100- Owner satisfaction
- 78
- Stage fit
- 84
Owner satisfaction from the product's Amazon star rating and review count; stage fit from our own assessment of how well it suits a dog at puppy, adolescent, adult, senior stage.
What the listing says
- Manufacturer states eight months per collar
- Waterproof, so swimming does not end the protection
- Nothing to remember monthly — the main real-world failure mode
Specifications
- Protection Duration
- 8 months (collar)
- Application Method
- Collar (wear and forget)
- Dog Size
- Over 18 lbs
- Active Ingredients
- Imidacloprid, Flumethrin
- Water Resistance
- Yes (waterproof)
- Flea & Tick Kill
- Fleas, ticks, lice
From the maker’s listing and Amazon’s product data. Fields the listing doesn’t state are left out, not assumed.
If this one isn’t right
Skip it if: Your dog is under 18 lb — this is the large-dog band — or your vet has recommended an oral preventive instead.
A different kind of thing — flea and tick spot-on rather than flea and tick collar.
$40.98
An adult or senior dog whose owner wants eight months of flea and tick prevention without a monthly reminder.
Seresto 8-Month Flea & Tick Collar
$49.99
← Back to the flea & tick comparisonNot sure what stage your dog is in? →
Gear
Pairs with
What tends to be needed alongside flea & tick — hand-picked adjacencies, not "customers also bought".
$35.27 Owner rating 4.7 out of 5 · 13,229
Brushing is the check: it is how a tick gets found before it has been attached a day.
$65.69 Owner rating 4.1 out of 5 · 1,247
The dogs that get ticks are the ones that get into long grass, which are the dogs that also get lost.
$45.99 Owner rating 4.5 out of 5 · 23,731
Peak tick season and peak heat season are the same months.
The rest of this shelf
Everything else we currently recommend on the flea & tick shelf — the same need, Protect.
