Where do fleas go after drops on a dog's withers? - briefly
After applying flea drops to a dog's withers, fleas typically migrate away from the treated area due to the active ingredients in the drops. They may move to other parts of the body where the concentration of the insecticide is lower or attempt to leave the host altogether.
Where do fleas go after drops on a dog's withers? - in detail
After applying flea drops to a dog's withers, the primary active ingredients in these topical treatments—such as fipronil, imidacloprid, or selamectin—begin to take effect. These compounds work by disrupting the flea's nervous system, leading to paralysis and death within minutes to hours after contact. Here is a detailed breakdown of what happens:
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Absorption into the Skin: The drops are applied directly onto the dog's withers (the area between the shoulder blades), which is an ideal location because it allows easy access for the dog owner and minimal disruption to the dog's coat. Once applied, the active ingredients start to absorb through the skin of the dog and into the sebaceous glands, which are present in higher concentrations on the withers.
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Distribution: As the flea drops are absorbed, the active ingredients distribute throughout the dog’s body via the bloodstream and lymphatic system. This ensures that a consistent level of the insecticide is maintained across the skin, providing continuous protection against fleas.
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Insecticidal Action: Fleas coming into contact with the treated areas ingest or absorb the active ingredients as they feed on the dog’s blood or walk through the treated zones. The compounds in the drops interfere with the flea's nervous system, causing immediate paralysis and eventual death within a short period (usually 24-48 hours).
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Elimination: Dead fleas are typically removed from the dog’s coat through grooming or natural shedding processes. The active ingredients in the drops have a residual effect, meaning they continue to protect against new infestations for an extended period (typically 30 days). However, it is important to note that while the drops kill adult fleas, they do not affect eggs or larvae already present in the environment. Therefore, additional environmental treatments may be necessary to break the flea life cycle completely.
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Repellent Effect: Some modern flea drops also contain repellents that deter fleas from jumping onto the treated dog. This dual action—killing existing fleas and preventing new ones from attaching—provides comprehensive protection for the pet.
In summary, after applying flea drops to a dog's withers, the active ingredients absorb into the skin, distribute throughout the body, and kill fleas by disrupting their nervous system. The residual effect ensures continuous protection against new infestations, while repellents in some formulations help prevent fleas from jumping onto the treated animal.