What Is The Difference Between Heartguard And Sentinel Or Interceptor Is There A Difference Between Heartgard Plus And Generic Heartguard Plus For My Rottweiler?

Is there a difference between Heartgard Plus and Generic Heartguard Plus for my Rottweiler? - what is the difference between heartguard and sentinel or interceptor

My dog has had all his shots. Want to save money on Heartgard MED. For the first time to see before he online with your doctor to order and $ 65 w / medical expenses. You can order online w / other pharmacy and pay $ 35 for generic Heartgard. However, he wondered, was the general Heartgard different.