How long do Barss drops for fleas and ticks work on dogs? - briefly
A single application of Barss topical drops protects dogs from fleas and ticks for approximately 30 days. Efficacy may decline slightly toward the end of the month, so re‑application at monthly intervals maintains full coverage.
How long do Barss drops for fleas and ticks work on dogs? - in detail
Barss spot‑on treatment delivers a single dose that protects dogs from fleas and ticks for approximately four weeks. The product contains fipronil (a broad‑spectrum insecticide) and (S)-methoprene (an insect growth regulator). After application to the skin, fipronil spreads across the coat and skin surface, killing adult fleas and preventing tick attachment within 24 hours. (S)-methoprene interferes with flea development, reducing egg and larval populations.
Key factors influencing the four‑week protection window:
- Weight and breed – dosage is calibrated for specific weight ranges; under‑dosing shortens efficacy.
- Bathing or swimming – water exposure within 24 hours after application can remove a portion of the product; subsequent baths do not significantly diminish protection.
- Skin condition – excessive oil or dermatitis may affect distribution, potentially reducing duration.
- Environmental flea pressure – heavy infestations may require supplemental control measures to keep numbers low.
Typical administration schedule:
- Apply the entire contents of one pipette directly onto the skin at the base of the neck, ensuring contact with the skin, not just the fur.
- Repeat the application every 28 days, regardless of observed flea or tick activity, to maintain continuous coverage.
- For puppies under eight weeks or weighing less than 2 kg, use a product formulated for small animals; standard Barss drops are not recommended.
If a dog is exposed to a high‑risk environment—such as kennels, dog parks, or areas with known tick hotspots—consider supplementing with a monthly oral or collar product, but maintain the spot‑on regimen to preserve the four‑week barrier.