Interpretation of the numbers recorded is as important as the numbers themselves, for the relationship between the hormones is complex. In addition, normal ranges of hormone vary somewhat with the breed or mix. Treatment Treatment consists of two daily doses of levothyroxine, the hormone identified in the test as T4. One to two months after starting the dog on thyroid therapy, the veterinarian will probably want to redo the tests to make sure the levels are within the normal range. Dogs on long-term thyroid therapy should have a complete panel of tests every six to 12 months.
Some dogs have a genetic susceptibility to diseases that attack their own immune system.
However, breeders should test their dogs and bitches, keep good records, and be wary of using animals with the potential to further spread the disease. Studies indicate that the breeds most commonly affected by autoimmune lymphocytic thyroiditis include Golden Retriever, Great Dane, Beagle, Borzoi, Shetland Sheepdog, American Cocker Spaniel, Labrador Retriever, Rottweiler, Boxer, Doberman Pinscher, German Shepherd, Akita, Old English Sheepdog, and Irish Setter. Symptoms usually appear between one and five years of age, but blood tests can indicate the potential for disease before clinical signs appear. Unfortunately, a clean thyroid test at one year of age does not mean the dog will remain free of disease throughout its life. In August 1996, the American Kennel Club Canine Health Foundation hosted an international symposium on canine hypothy-roidism at the University of California at Davis.