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Activyl Large Dogs & Puppies 45-88lbs, 6-pack

Amazon.com Price: $169.00 (as of 04/10/2023 00:06 PST- Details)

Proven to start killing fleas fast within 8 hours, and lasts for a full 4 weeks
Kills fleas that may cause flea allergy dermatitis
Breaks the flea life cycle to prevent new fleas from developing