Can I Give My Dog Heartguard If It Has Heartworms?
Can I Give My Dog Heartguard If It Has Heartworms? Heartworm preventives do not kill adult heartworms. Also, giving a heartworm preventive to a dog infected with adult heartworms may be harmful or deadly. If microfilariae are in the dog’s bloodstream, the preventive may cause the microfilariae to suddenly die, triggering a shock-like reaction and