It is much easier to prevent a flea outbreak than to eradicate one. With MoxiclearÂ®, prevention is made easy. With it's simple spot on formulation, your pet is covered against fleas, heartworms and intestinal worms for a month at a time. Suitable for puppies as young as 7 weeks and kittens from 9 weeks of age. Try MoxiclearÂ® today, available in 3 and 6 packs.