[n8xwb]

We adopted a dog that was heartworm positive, supposedly treated once, but had to be treated a second time before she was negative. You need to speak with a vet BECAUSE GIVING HER/HIM THE WRONG HEARTWORM MEDICINE WILL KILL HER! Most heartworm preventive meds are just that....they will prevent the disease but not meant to treat it. If the dog is given one of these, the worms die, but will kill the animal. Please speak with a vet.