is it really necessary to do a blood test every year on my dogs for heartworm when they just finished last years' dosage only 4 months earlier? this gets quite costly with 2 or 3 dogs.
Well, it is recommended that a blood test is done if you took the dogs off heartworm preventative. Would it be cheaper to continue the heartworm year round? If so, then a blood test is usually recommended every 2 years. vetcare