My favorite is Interceptor followed by Heartgard followed by Heartgard Plus. If I didn't get it at the vet, I would get it from entirelypets.com. Their meds are FDA and EPA approved.
It is okay to change but if a dog is on a med year-round and has its blood checked every year, the company may pay for treatment if your dog gets heartworm while on their med.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |