Updated On September 23rd, 2025
How long does it take for the Seresto collar for dogs to work?
1 Answer
Published on June 14th, 2018
According to Bayer, Seresto collars kill existing fleas on dogs within 24 hours after being applied. From that point onward, re-infesting fleas are killed within only two hours. Regarding ticks, infestation prevention with new ticks is effective 48 hours after the collar is applied, while re-infesting ticks are repelled or killed in 6 hours. Hope this helps!
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