Yes, you can put a Seresto collar on a dog with fleas. The Seresto collar is an easy and effective way to control flea and tick infestations in dogs. It uses an innovative technology called imidacloprid/flumethrin which kills the fleas, ticks and other parasites that feed from your pet. The active ingredients are slowly released over time, providing long-term protection. The collar lasts up to 8 months and provides continuous protection even after swimming or bathing. When properly applied, it helps protect your pet against flea and tick infestations as soon as 24 hours of application. However, please keep in mind that Seresto collars should not be used on puppies under 10 weeks old or cats of any age since their safety has not been evaluated yet.
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