Thyroidectomy

A thyroidectomy is the surgical removal of one or both thyroid glands located in the neck. While the procedure is similar for both cats and dogs, the underlying reasons for surgery and the typical outcomes differ significantly between the two species. 

When is it Necessary?

• In Cats: The primary indication is hyperthyroidism, usually caused by benign (non-cancerous) growths called adenomas that produce too much hormone. Surgery is an option for owners seeking a one-time permanent cure rather than daily medication.
• In Dogs: Surgery is most often performed to remove thyroid tumors, which are more likely to be malignant (cancerous) in dogs. It is necessary when a mass is growing, causing difficulty swallowing or breathing, or risking spread to other organs. 

Potential Complications

• Calcium Crisis (Hypocalcemia): The most critical risk, especially when both glands are removed. It occurs if the tiny parathyroid glands (which regulate calcium) are accidentally damaged or removed. Signs include twitching, facial itching, and seizures.
• Hemorrhage: Significant bleeding during or after surgery is a risk because thyroid tumors are often highly vascular, particularly in dogs.
• Nerve Damage: Injury to the laryngeal nerve can cause voice changes (hoarseness) or, in rare bilateral cases, difficulty breathing. Damage to the sympathetic trunk can cause Horner’s Syndrome, affecting eye appearance.
• Hypothyroidism: Removing both glands may result in a permanent hormone deficiency, requiring lifelong supplementation. 

Post-Operative Care

• Activity Restriction: Your pet must rest for 14 to 21 days to allow the incision to heal. Use a harness instead of a neck collar to avoid pressure on the surgical site.
• Incision Monitoring: Check daily for swelling, redness, or discharge. Some minor swelling is normal, but rapid increases require immediate veterinary attention.
• Medication & Diet: Follow the full course of prescribed pain relief and antibiotics. A soft food diet may be recommended for the first few days to ease swallowing discomfort.
• Calcium & Hormone Monitoring: Cats and dogs may require frequent blood tests in the days following surgery to monitor calcium levels. Long-term, they may need daily thyroid hormone or calcium supplements.

Signs of a Calcium Crisis (Hypocalcemia) 

This is the most critical post-operative complication and typically appears within 1 to 5 days. 

• Muscle Twitching or Tremors: Involuntary movements, especially in the face or legs.
• Facial Itching/Rubbing: Your pet may obsessively rub their face against objects or paw at their muzzle.
• Stiff or Uncoordinated Gait: Walking as if their legs are rigid or they are “drunk”.
• Behavioral Changes: Sudden anxiety, restlessness, aggression, or disorientation.
• Panting: Excessive panting even when resting.
• Seizures: This is a life-threatening sign of severe calcium depletion. 

Respiratory & Circulatory Issues

• Difficulty Breathing: Wheezing, gasping, or increased effort to breathe.
• Rapid Neck Swelling: This can indicate internal bleeding (a hematoma) that may compress the airway.
• Gum Color Changes: Pale gums (blood loss) or bluish-purple gums (lack of oxygen). 

Incision & Systemic Concerns

• Profuse Bleeding: Blood that soaks through a bandage or drips continuously from the incision.
• Sudden Lethargy or Collapse: If your pet is unable to stand or appears extremely weak.
• High Fever: A rectal temperature over 101.5°F (38.6°C) for dogs or cats.
• Severe Vomiting or Diarrhea: Especially if they cannot keep water down. 

If you are unsure whether a symptom is serious, the safest action is to call your veterinarian or a 24-hour emergency clinic immediately.