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Sentry Fiproguard is a monthly spot-on flea and tick treatment for dogs that uses fipronil at 9.70%, the same active ingredient as Frontline. It kills adult fleas and ticks, is waterproof, and is labeled for use on pregnant, breeding and lactating dogs. It is a lower-cost alternative to brand-name fipronil drops, but it does not kill flea eggs and larvae, so it works best as part of a prevention routine. Owners report mixed results: some see fleas gone within a day, while others find it slow or ineffective, especially in heavy infestations.
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Lowest price we've seen: $15.42 on Nov 11 at PBS Animal Health. Tracked across 7 stores since Nov 11.
Ratings are middling. Many owners say it cleared fleas quickly and costs less than vet brands, while a sizable share report fleas or ticks persisting and question whether the dose is strong enough.
Sentry Fiproguard Flea & Tick Squeeze is a monthly spot-on treatment for adult dogs. It contains fipronil at a 9.70% concentration and treats and prevents fleas and ticks. It targets adult fleas.
The topical solution is applied to the dog and works for up to 30 days. The formula is waterproof and odorless. It is made for dogs weighing 23-44 lbs and can be used on pregnant, breeding and lactating dogs. Do not use it on cats.
