Next, you can help prevent bacterial growth from the tick bite. Garlic, Licorice and Skullcap are very effective for protecting against bacteria as will B vitamins. Allimax Nutraceuticals in conjunction with the Health Healing and Hope Foundation completed a clinical study on the effects of allicin (garlic extract) on the Borellia spirochete which showed a reversal of the cystic form of Borrelia Burgdorferi. Licorice root contains up to 33% antibacterial compounds on a dry-weight basis and contains saponins which increase the availability of other antibiotic compounds.
There are natural thyroid supplements that may help if the condition is not too bad. Armour Thyroid and Westhroid are natural thyroid supplements that may be used in place of synthetic supplements. These natural supplements contain T3 (as well as small amounts of T4) and may help dogs that cannot convert T4 to T3. Thyrolar and Cytomel are two other supplements that contain T3, for those dogs that continue to have problems despite normal T4 and TSH values. See the following articles for more information on Armour Thyroid vs. Synthroid:
Synthroid: Not FDA Approved! (click on Synthroid under Articles)
Why Do You Insist on Synthroid Instead of Armour? -- A Patient's Letter
How To Switch From Synthroid To Armour Thyroid