Johnson's 4fleas Tablets for Puppies and Small Dogs are a fast-acting flea treatment that kills fleas on puppies and small dogs from 4 weeks of age and up to 11kg. These tablets start killing fleas in just 15 minutes, with 95-100% efficacy observed within the first 6 hours and complete efficacy reached within 24 hours. As the first fully licensed, over-the-counter oral flea treatment for cats and dogs, 4Fleas is a market-leading product that kills all fleas on cats and dogs within 24 hours. It has no side-effects, leaves no pesticidal residues in the fur or home, and is safe to use with other flea and worming treatments. It can be given to puppies and kittens over 4 weeks old (over 1kg).