Fleas run in 3 weeks cycles. I have dogs and cats in the house. I use "Enforcer Flea Spray" for carpets & furniture. Find this at "Walmart" I also use Borax (found in detergent isle), and table salt mixture on the animals and carpet and furniture. You can leave it on the animals and leave on carpet, furniture for a day. Vacume and make sure to throw outside the stuff you sweep up. Borax kills the adult fleas while the salt kills the larva stage. Do this every week to make sure you break
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the cycle. You also can use natural ingredients of lemon juice, peppermint oil,and clove oil. This will not kill fleas but will keep them off your pets. Best thing to remember is to be persistant, fleas are a tough battle but you can win!