The thyroid gland produces hormones that affect the body’s metabolism, growth
and development. The two most important hormones are tetraiodothyronine (thyroxine
or T4) and triodothyronine (T3). There are two conditions caused by a
dysfunctional thyroid gland – hyperthyroidism and hypothyroidism.
Hyperthyroidism is more common in cats and is caused by an overactive thyroid
gland with the resulting overproduction of hormones. Hypothyroidism, which is
more common in dogs, is caused by an under active thyroid gland that is not
producing enough hormones resulting in decreased metabolism.
Hyperthyroidism is diagnosed so often in cats that it has practically become an
epidemic. It is rarely seen in dogs. It is more common in older cats, but may be
seen in younger cats as well. Hyperthyroidism is generally a result of benign
(non-cancerous) changes or enlargement of the thyroid gland. It seems to be more
common among cats that have been fed sub-standard nutrition and food containing
artificial preservatives. Some holistic veterinarians feel they have seen an
increase in hyperthyroidism that corresponds to the increased vaccination rate
for feline leukemia. Viral and bacterial infections can also play a role, as
well as environmental toxins.
What You Need to Know About Your Pet’s Food
All About Raw Food
The Importance of Daily Supplements for Your Companion
Inflammatory Bowel Disease & Other Gastrointestinal Issues
Dealing with Kidney Failure in Cats and Dogs
The Truth About Pet Vaccinations
A Manual of Natural Veterinary Medicine by Dr's Susan Wynn and Steve Marsden
Herbs for Pets by Mary L Wulff-Tilford & Gregory L Tilford
The Nature of Animal Healing” by Martin Goldstein, DVM
VeterinaryPartner.com - The Pet Health Library – “Hypothyroidism in Dogs” by
Wendy C. Brooks, DVM, DipABVP
Dr. Pitcairn’s Complete Guide to Natural Health for Dogs & Cats” by Dr. Richard
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The articles and information in the Holistic Healthcare Library are presented for
informational purposes only and are not intended as an endorsement of any product.
The information is not intended to be a substitute for visits to your local veterinarian.
Instead, the content offers the reader information and opinions written by our staff,
guest authors, and/or veterinarians concerning animal health issues and animal care