Thyroxine for Dogs

Hypothyroidism is a very common disease in dogs. It occurs when the thyroid does not produce enough thyroid hormones, called thyroxine (T4) and triiodothyronine (T3). These hormones are essential for normal metabolism, energy production and regulation of body temperature. Hypothyroidism is caused by inflammation or damage to the thyroid gland from autoimmune disease, infection or cancer. The main treatment for hypothyroidism is daily supplementation with thyroxine to replace the missing hormone.

About Thyroxine

Thyroxine is a hormone produced by the thyroid gland, which is located in the neck. It helps regulate the metabolism of your pet’s body and increase energy levels.

Thyroxine deficiency can be caused by an underactive thyroid or damage to the gland itself. In dogs, it’s usually due to autoimmune disease or inflammation of their thyroid glands. Thyroid hormone replacement therapy can be used to treat this condition so that your dog can live a healthy life again!

Common Uses of Thyroxine

Thyroxine is used to treat an underactive thyroid, called hypothyroidism.

In small doses (0.1 mg per kg of body weight), it can also be used to treat hyperthyroidism in small dogs; however, the side effects are more severe than those observed with larger dogs.

Thyroxine can also be used for other conditions involving the thyroid that are not specifically mentioned here: thyroid cancer, thyroiditis and for any form of hypothyroidism except for autoimmune diseases where thyroxine levels may need further investigation prior to starting therapy with this drug

Thyroxine Administration

When administering thyroxine, it is important to know the proper dosage for your dog. The right dose will depend on a number of factors:

  • The animal’s weight
  • The animal’s age
  • The animal’s condition

How to Give Thyroxine to Dogs and Cats

Luckily, thyroxine is very easy to administer. If your dog or cat needs a single dose of medication, it can be given by mouth. For long-term administration, liquid thyroxine can be administered by mouth once daily or divided into smaller doses throughout the day.

If you have a dog that weighs less than 20 pounds (9 kg), the liquid form may not be suitable since small dogs may not ingest enough liquid in one sitting to get the full dosage.

In small cats as well as large dogs (and even humans) who are unable to swallow pills whole due to choking fears or other issues with swallowing medications whole, crushed tablets can also be mixed with food and served up as tasty treats!

Thyroxine Side Effects

If you give your dog too much thyroxine, it could have the following side effects:

  • Increased appetite
  • Increased thirst
  • Increased urination
  • Increased heart rate
  • Increased breathing rate
  • Increased body temperature

In order to prevent these side effects, keep an eye on how much thyroxine your dog is getting.

A lot of things can go wrong if your pet is not getting the right dosage of thyroxine.

Thyroxine is a hormone produced by the thyroid gland. It helps to regulate your pet’s metabolic rate, which is how fast their body processes food and converts it into energy. If your dog isn’t getting enough thyroxine for their body to function properly, they can develop symptoms such as weight loss, lethargy and weakness.

Thyroxine should not be confused with vitamins or other medications that may be prescribed by your veterinarian; thyroxine is neither vitamin nor drug but rather a hormone that must be carefully monitored because too much or too little will cause problems in your pet’s health. Thyroid hormones are not steroids either; steroids are medications that help reduce inflammation in the body (and many dogs get them when they have arthritis).


Dogs with hypothyroidism will benefit from the proper use of thyroxine. If you think your dog has hypothyroidism, ask your vet about using this medication. Just make sure to follow their instructions and carefully monitor your dog’s symptoms as it gets used to being on the medicine.