Where do fleas go after flea drops are applied to the nape? - briefly
The drops act on the parasites, forcing them to fall from the neck onto nearby surfaces where they soon die. Any that attempt to move elsewhere are quickly killed by the medication as they crawl through the coat.
Where do fleas go after flea drops are applied to the nape? - in detail
Applying a spot‑on product to the cervical region creates a chemical barrier that spreads across the animal’s skin through the sebaceous glands. Within minutes, the active ingredient contacts any ectoparasite present on the coat.
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Immediate displacement – Fleas already on the animal are exposed to the insecticide. The irritant effect forces most of them to detach from the hair shaft and fall to the floor or surrounding surfaces.
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Systemic migration – Ingredients absorbed into the bloodstream circulate to all body regions. Fleas that bite after treatment encounter lethal doses when they ingest blood, causing rapid paralysis and death while still on the host.
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Environmental redistribution – Dislodged fleas drop onto bedding, carpet, or floor coverings. From these sites they may crawl to other hideouts (cracks, furniture, outdoor areas) before succumbing to the residual insecticide that may be present in the environment.
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Residual activity – The chemical layer on the skin persists for weeks, providing ongoing protection. Any flea that attempts to re‑infest the animal contacts the treated surface and is killed before it can reproduce.
Overall, the treatment forces fleas off the host, exposes them to lethal doses systemically, and reduces the likelihood of re‑colonization by contaminating the immediate surroundings.