Seresto 8-Month Flea & Tick Collar

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

Researched from the manufacturer’s listing, its published specifications and what owners report. We do not test products on dogs.

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

Specs come from the manufacturer listing and Amazon’s public product data. A field that reads “Not stated” is one we have not verified — not one the product lacks. We research and analyse; we do not test products on dogs.