Heartworm treatment is expensive, which is why DAS offers 100% FREE Heartworm treatment on eligible* Heartworm positive dogs.   DAS works to provide Heartworm treatment for all dogs that are Heartworm positive when they’re in our care; at this time, we are not able to offer treatment for dogs that contract Heartworms after they are adopted.    Though rare, some dogs cannot safely be treated in our facility due to factors that put them at a high risk of complication. These dogs require treatment at a specialized, full-service private facility, which DAS is unable to cover.