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Hartz Ultra Guard Dog Flea & Tick CollarHartz Ultra Guard Dog Flea & Tick Collar is water resistant and effectively repels fleas and ticks for up to 7 months. The flea collar begins to kill fleas and ticks immediately. Its full protection against harder to kill ticks will be built up within a few days after being placed on the pet. The collar kills ticks for 5 months and aids in their control an additional 2 months.