If you are seeing adult fleas on your pet, not only are there more fleas elsewhere in your house, but there are also younger fleas and flea eggs present too. (parkanimalhospital.com)
Nylar is unique in the way it works — it mimics the juvenile flea hormone, preventing young fleas from becoming adults. (caninejournal.com)
It then continues to work by preventing eggs and young fleas from developing and by repelling them for up to a month. (vetdepot.com)