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Dogs should be tested for heartworms before beginning a heartworm prevention program, or when changing from one heartworm preventive to another. Dogs that are already on heartworm preventive medication should also be tested periodically.The âprepatent periodâ for heartworm disease (the amount of time it takes for microfilariae to be produced) is approximately 6 months in a dog.During this time, heartworm tests will be negative even if a dog is actually infected. Therefore, puppies younger than 7 months old are generally not tested for heartworms.ogs should be tested for heartworms before beginning a heartworm prevention program, or when changing from one heartworm preventive to another. Dogs that are already on heartworm preventive medication should also be tested periodically.
How long before dog heartworm symptoms show? How long can a dog have heartworms before symptoms of the dog heartworms can be seen? By: Sandra Parker El Segundo, CA Replied on 04/19/2011 The answer to this question is tricky because there are no hard and fast rules about the manifestation of symptoms of heartworm disease in dogs.