Johnsons 4fleas tablets puppy an oral treatment for dogs and puppies over 4 weeks old to kill adult fleas the effects of the treatment can be seen as soon as 15 minutes after administration this treatment is only fully effective if used as part of a programme to eliminate fleas from pets and their surroundings such as their bedding carpets and soft furnishings eg johnsons 4fleas household flea spray fleas can be detected by parting the pets coat and examining the skin for signs of fle