When looking to purchase heartworm preventive for your dog or cat, you can find various options available in the market. But, before buying any heartworm medication, it’s crucial that you find out with the help of your vet whether your dog is suffering from heartworm infection or not. In case, if the diagnosis is positive, the vet will put your furry friend on heartworm medications. And, if the report is negative, your vet will recommend…