How mich does a heartworm vaccination cost and how does that work? Do I have to do it monthly?

For heartworm preventative treatment it about 10 dollars per month depending on dogs weight. It is not a vaccination, you give your dog a pill each month. If your dog is heartworm positive, the treatment can be up to 495 dollars depending on the size of the dog. Emancipet let's you split that cost into two payments. Hope this helps. It's a wonderful place to take your pets for treatment.

What Laurie said !