FRONTLINE Tri-Act® FOR DOGS and FRONTLINE Plus® are suitable flea treatments for puppies aged 8 weeks and over as long as they weigh at least 2 kg. So, it's not just age that can make a difference to the kind of flea treatment you use for your puppy: you should also consider their weight.
Can I use Frontline on my 8 week old puppy?
It is safe to treat puppies and kittens with FRONTLINE SPRAY from 2 days of age. Puppies and kittens can be treated with FRONTLINE PLUS from 8 weeks of age. FRONTLINE PLUS FOR DOGS should be applied every 2 weeks for control of paralysis ticks on dogs, or every month for control of brown dog ticks.