Does not work at all. All but one of the puppies in the litter had a Hartz flea collar. He had a TSC Zodiac. Five to five Hartz collared puppies had horrible fleas within a week. The pup with the Zodiac collar didn't have them. The vet recommended Parastar Plus. We bought this and used it on five puppies that had fleas. All fleas were gone within 36 hours. Hartz collars were a waste of time and money.
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