If you have a dog with anxiety for any reason (thunder, fireworks, etc), the Thundershirt may work for him.

As with most Veterinary treatments, there is more than one way to do things.  This may even be more true with alternative therapies.  Please see the blog titled "Hypothyroidism" for information about they symptoms.   Here are some suggestions for alternative treatments for hypothyroidism.

1)Armour (Thyroid Tablet USP) – Desiccated thyroid extract, containing T3 and T4 thyroid hormones. This is a suggested conversion from synthetic Thyroxine. 

Armour Thyroid                 Synthetic Thyroxine
Tablets 15 mg (¼ grain)             0.012 mg
Tablets 30 mg (½ grain)             0.035 mg         
Tablets 60 mg (1 grain)              0.075 mg
Tablets 90 mg (1½ grain)            0.1 mg
Tablets 120 mg (2 grain)             0.15 mg
Tablets 180 mg (3 grain)             0.2 mg
Tablets 240 mg (4 grain)             0.3 mg
Tablets 300 mg (5 grain)             0.35 mg  

in "Small Animal Endocrinology", Feldman and Nelson state:
'Crude animal-origin thyroid preparations are not recommended for the treatment of hypothyroidism in dogs. Nevertheless, these preparations have been used successfully. The recommended dosage is 15-20 mg of dessiccated thyroid per kg of body weight once daily (Rosychuk, 1982). Ideally the tablet should be crushed and administered with a small amount of food.'
    

Caution:  Dogs love the taste of Armour, and may ingest the entire bottle.  Keep it in a safe, secure location.    

Armour is expensive.  For example, if you had an 80 pound dog on 0.8mg of Thyroxine, it may cost $0.20-0.30 per tablet; and it could cost $3.00 to $3.50 for the appropriate dose of Armour Thyroid.      

2) Canine Thyroid Support (Standard Process) – thyroid, liver, adrenal, digestive, kidney support.  This can be used to lower the dose of thyroxine.

3) Musculo-skeletal support (Standard Process) – If muscle weakness.  Supports muscles, tendons, nerves, liver, kidney, and adrenal.

4 ) Coenzyme Q10 – strong antioxidant.

5 ) Alpha-lipioic Acid (Naturals) – antioxidant that can also increase the activity of other antioxidants, which is important in thyroiditis.   

6) Chinese Herbs – Hypothyroidism is a Spleen and Kidney Qi and Yang deficiency. 

These are just suggestions, and your Veterinarian can decide on what your specific pet needs, depending on what symptoms you pet is exhibiting.  For example, if you pet is having skin and ear issues, an Essential Fatty Acid may be added.