Flea collars are a safe and effective way to control fleas on dogs. While they start working immediately, the active ingredients in flea collars spread over time to cover the entire body for maximum protection. They are a long-lasting form of flea control, from 6 to 8 months depending on the collar. Many flea collars are waterproof as well, while others are water resistant. Some may repel mosquitoes and other biting pests in addition to fleas. Natural flea collars work by repelling pests and can be an effective alternative to synthetic insecticides in other collars. Note that some dogs may be sensitive to ingredients in both conventional or natural products, so read and follow directions carefully. Discontinue use if sensitivity or side effects occur.
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