Your vet is the best source for information on heartworm disease and prevention. The internet has something bad to say about every drug out there. It is your vet's job to weigh the risks and benefits for you. Find one you trust and talk to them about the importance of this.
I'd be far more concerned about arsenic injections into my dog's back and the risk of death from treatment of heartworm disease than about the possibility that maybe someday there might be a possible issue with the prevention.
There will always be people online that tell you the prevention is too dangerous, there are side effects (there are - that is true), and that natural preventatives are just as trustworthy. These people almost never have a DVM behind their name. It's usually an opinion not really based on what is considered standard of care.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |