A. Only 5-10% of the flea burden is present on a pet at any one time, the rest are eggs/larva/pupae in the environment waiting to hatch and reinfest your pet. Most flea treatments work for a number of weeks and only on the adult fleas which are on on near your pet so the cycle will keep going. It is important to treat the entire house with a spray which kills/inactivates eggs and juvenile stages and to keep your pug up to date with flea prevention; either the long acting tablet version or alternate frontline and advantix until the cycle is broken. It is possible he has also developed allergies to fleas or a skin infection from the damage done by scratching and this may require veterinary treatment in order to resolve issue completely
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