Thyroid Disease in Pets
Thyroid Disease in Pets - Hyperthyroidism in Cats & Hypothyroidism in Dogs
At Cara Veterinary Group in Dublin 15 (Ballycoolin) and Dublin 7 (Phoenix Park Gate), we diagnose and treat thyroid disorders in dogs and cats. These conditions are among the most common hormonal diseases seen in older pets and can cause significant changes in weight, energy levels, and coat condition - but with the right treatment, most pets recover well and live happy, healthy lives.
BOOK A CONSULTATION • Call 01 885 3253 • Join our Pet Healthcare Plan for ongoing preventative care
What Is the Thyroid Gland?
The thyroid gland is located in the neck, either side of the windpipe. It produces hormones that regulate your pet’s metabolism - controlling how quickly they burn energy, how warm they stay, and how active they feel. When this gland produces too much or too little hormone, your pet’s health can be seriously affected.
Hyperthyroidism in Cats (Overactive Thyroid)
Hyperthyroidism is one of the most common diseases in middle-aged and older cats. It occurs when the thyroid gland produces excessive thyroid hormone, speeding up the cat’s metabolism.
Symptoms of Hyperthyroidism in Cats
- Weight loss despite a strong or increased appetite
- Increased thirst and urination
- Hyperactivity or restlessness
- Unkempt, dull, or matted coat
- Vomiting or diarrhoea
- Rapid heartbeat or high blood pressure
- More vocal or anxious behaviour
During a veterinary exam, we may detect enlarged thyroid glands and a high heart rate. If left untreated, hyperthyroidism can lead to heart or kidney complications, so early diagnosis is key.
Treatment Options for Cats
- Medication: Daily tablets to control thyroid hormone levels.
- Prescription diet: Low-iodine diet that limits hormone production.
- Surgery: Removal of the overactive thyroid gland.
- Radioactive iodine therapy: A highly effective, permanent treatment available through referral centres.
Routine bloodwork is always recommended to check for concurrent conditions such as kidney or heart disease.
Hypothyroidism in Dogs (Underactive Thyroid)
Hypothyroidism occurs when the thyroid gland does not produce enough hormones, slowing down the dog’s metabolism. It most often affects middle-aged to older dogs, particularly breeds such as Labradors, Golden Retrievers, Dobermanns, and Setters.
Symptoms of Hypothyroidism in Dogs
- Weight gain without increased food intake
- Low energy or reluctance to exercise
- Increased thirst and urination
- Coat colour change (black coats turning brownish)
- Thinning coat or symmetrical hair loss
- Dry skin or flaky patches
- Slowed heart rate and low body temperature
Diagnosis is confirmed via a simple blood test measuring thyroid hormone (T4) and other related levels. Treatment involves lifelong thyroid hormone replacement tablets, which most dogs tolerate extremely well.
Diagnosis and Ongoing Monitoring
Thyroid conditions are diagnosed with blood testing, which can be performed in-house at Cara Veterinary Group. We often recommend routine wellness blood screens for pets over seven years old to identify thyroid problems early.
Once stabilised on treatment, regular rechecks help ensure your pet’s hormone levels remain within the ideal range for optimal health and energy.
Book Your Appointment
- This service is not available for online booking. Please call 01 885 3253 and ask for James the Vet for specialist advice and scheduling.
- If your pet is unwell, book an Illness Consultation online or by phone.
Our Locations
Cara Veterinary Hospital - Unit 233, Blanchardstown Corporate Park 2, Ballycoolin, Dublin 15 (D15 Y384)
Cara Veterinary Clinic - 1A North Circular Road, Phoenix Park Gate, Dublin 7 (D07 HE48)