Hartz Ultra Guard Pro Flea & Tick Drops for Dogs 16-30lbs-3 per-Box :From the Manufacturer: Hartz UltraGuard Pro Flea and Tick Drops The new Pro-Glide applicator (patent pending) easily penetrates the fur and is angled for improved application direct to your dogs skin. This is a monthly treatment that kills and repels fleas and ticks on contact for up to 30 days, kills mosquitoes and kills and prevents flea eggs and flea larvae from developing. It kills all stages of the flea life cycle and prevents re-infestations for up to 30 days. Use only on dogs over 12 weeks of age. Do not use on cats or kittens. Package contains 3 monthly treatments.