Novartis Animal Health Key information regarding Sentinel and Interceptor can be found here.

Merial Animal Health This site gives very useful information regarding Heartguard and Frontline Plus.

dogsandticks.com information on ticks, the diseases that ticks can carry, treatment and prevention, and also where in the United States these diseases are most common.

Fleas 

Feline health pets and parasites have a great website regarding 

The American Heartworm Society information about heartworm transmission, prevention, and treatments in dogs.

Heartworm and Intestinal Parasite Prevention

         Interceptor  

         Trifexis         

         Heartgard  

Flea and tick preventatives

         Frontline flea and tick prevention

           Advantix for information about flea and tick prevention