We highly recomend Revolution (made by Pfizer).

   To get the most out of your dollar, Revolution takes care of all listed below. 

   Most Common:
   Fleas
   Ticks  
   Most Mites  
   Heartworms  


   Additonally, it is least toxic and the only product recomended for 
   small puppies or kittens and pregnant or nursing females.   
 
As a stand alone heartworm preventative, we recomend Iverheart