Our flea control power can be used weekly, but do not use on nursing dogs or cats, or kittens and puppies under 12 weeks of age. This flea control is in a convenient stay fresh corrugated packing with turn dial dispenser top fro easy use. We also offer convenient spray. This new flea control formula contains two active ingredients which kills them instantly and keep them off for days. DD-33 is water based (unlike similar sprays which are up to 40 percent alcohol) and therefore gentle to the skin and hair. It is formulated for minimum toxicity to dogs and cats, including the most sensitive breeds. This spray flea control is citrus scented.