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Sentry Fiproguard Liquid Dog Flea Drops are a topical spot-on treatment that kills fleas and ticks on dogs. The active ingredient is fipronil, the same class of insecticide used in Frontline, applied between the shoulder blades once a month. It is a lower-cost alternative to brand-name spot-ons, and owners generally find it easy to apply. It suits dog owners who want a simple monthly flea and tick treatment without a vet visit, though it does not cover heartworm or intestinal parasites.
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Lowest price we've seen: $17.99 on Nov 11 at Chewy. Tracked across 2 stores since Nov 11.
Owners who use it report that it controls fleas well for the first few weeks and is easy to apply. Some complain that fleas return before the month is up and that the liquid leaves a greasy patch or irritates sensitive skin.
