In the meantime, for those considering it, here are a couple of the sites that you can get information from that shows the other side of the argument - not just the vet's trained response.
ProHeart 6 - Is It Really Safe? - Side Effects
The following are possible side effects, as admitted by Fort Dodge in their letter to verterinarians. The rate of these side effects is quite high compared to other heartworm preventatives on the market, and therefore I fear that people may be sacrificing safety for the sake of convenience.
Here are just a few of the potential side effects:
* Swelling and pain at the site of the injection.
* Facial swelling
* Diahhrea and vomitting
* Lethargy and fever
* Wobbliness and weakness
* Shortness of breath
* Erythema multiforme (bodywide disease with a characteristic rash involving the skin and mucous membranes)
* Autoimmune hemolytic anemia (destruction of red blood cells)
* Seizures and other neurological events
This information is directly from the manufacturer and yet vets are telling puppy owners to get this injection at the same time as a vaccination!ProHeart® 6 is generally well tolerated. Do not use in sick, debilitated or underweight animals, animals with a history of weight loss, or within one month of vaccination. Use with caution in dogs with pre-existing allergic disease. A small percentage of dogs showed mild, transient swelling or itching at the injection site. While rare, allergic, digestive, hematological, or neurological reactions may occur. In addition, death has been reported. ProHeart 6 is available only through a restricted distribution program. Only veterinarians enrolled in this program can receive and administer ProHeart 6. In addition, ProHeart 6 must only be administered to clients whose owners have been advised of the risks of ProHeart 6 and sign an Owner Consent Form.
I have a plethora of websites that detail all of the risks associated with the heartworm injection and there is far too much risk for me.
I use and recommend Sentinel Spectrum - purely because it's a beef flavoured, chewable tablet that treats intestinal worms, heartworm and fleas all at once. It's once a month and in every box there are stickers for the calendar to remind you when it's due. I always buy a new lot the same week that I have administered the last from the box. I never run out or miss a dose.
Just the opinion that I have come to after years of research.