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Thyroidectomy in the dog is a surgical procedure to remove a cancerous thyroid gland.
Dogs have two thyroid glands located either side of the trachea (windpipe) in the neck. The main disease linked to the thyroid glands in the dog is underactivity (hypothyroidism) however, a small percentage can suffer from a cancer of the thyroid gland. Unfortunately, around 90% of canine thyroid tumors are malignant and liable to spread. This makes early detection and removal the treatment of choice. Breeds most associated with thyroid carcinoma include the Golden retriever, Beagle, and Boxer.
Thyroidectomy in the dog can be problematic, due to invasion of major blood vessels. Therefore, this procedure is usually undertaken by a specialist surgeon. However if the cancer is detected early and remains small and encapsulated, a vet in general practice may attempt the surgery.
The thyroid glands are located beside major blood vessels such as the jugular vein, and alongside the laryngeal nerve. Thyroid tumors may invade surrounding blood vessels, so the patient must be carefully screened for blood clotting disorders prior to surgery.
It is also wise to fully stage the cancer, because if there is advanced metastatic spread already present in the lungs, then surgery to remove the thyroid is of limited use.
Those dogs taken forward to surgery are given pre-emptive pain relief and general anesthesia induced. The dog rests on their back and the fur is clipped from the neck and throat region. Under aseptic conditions, the surgeon makes a linear incision longitudinally along the neck over the area of the windpipe.
The muscles overlying the trachea and thyroid are carefully dissected away, taking care not to disturb the laryngeal nerve or damage blood vessels. The thyroid gland is dissected free and removed in its entirety.
The muscles are then repaired and sutures placed in the skin. The dog is woken from the anesthetic and monitored for signs of swelling or hemorrhage. Most dogs are allowed home within 24 hours of surgery and return for a postoperative check two days later and suture removal after 10 to 14 days.
The smaller the thyroid tumor the greater the chance of removing the gland in its entirety. However, the inverse is also true where the larger the tumor the less the chance of removing all the cancer cells and there is also a greater risk that metastasis (secondary spread) has already occurred.
The long-term outlook depends how cleanly the thyroid was removed and whether spread has already happened on a microscopic level. The average survival time for canine patients after thyroidectomy for cancer is 20 months.
For the majority of patients. early surgical removal is the treatment of choice. However, for large thyroid tumors or those that have invaded blood vessels then alternative treatments may help extend life. These options include radiotherapy or injection with radioactive iodine. These are unlikely to be curative.
For successful, uncomplicated thyroidectomies, most dogs can recover at home and the sutures are removed after 10 to 14 days. During the recovery period, using a harness instead of a collar for restraint is advisable.
Complications can and do occur. These include hemorrhage from blood vessels invaded by the thyroid, hypothyroidism (low levels of thyroid hormone in the blood), and low blood calcium levels. The latter can occur with the removal of the parathyroid glands which sit on top of the thyroid gland.
Another complication is damage to the laryngeal nerve. This can lead to a narrowing of the larynx which interferes with the dog's ability to breathe and can make swallowing difficult.
The workup for a thyroidectomy involves advanced imaging techniques such as an MRI or CT scan. This is liable to incur charges in the region of $1,500. Further tests to check lymph nodes and stage the cancer may cost around $500. The surgery itself ranges from relatively straightforward to very complex (if blood vessels are invaded). At a referral center, costs in the region of $2,500 to $3,000 should be anticipated.
Surgery is most likely to be successful when the tumor measures less than 4 cm in diameter. For these cases when the whole thyroid gland is removed, and in the absence of secondary spread, there is a good chance of obtaining a surgical cure.
However, for advanced or large tumors the chance of cure is reduced, and the risks and benefits should be carefully weighed up and discussed ahead of surgery. It may be that at best surgery extends survival time, rather than cures the dog.
There are no known triggers for thyroid carcinoma, therefore prevention of its development is not possible.
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5 found helpful
My vet has recommended a thyroidectomy for my 12 year old male springer Spaniel due to a cancerous tumor on his thyroid gland. ( the cancer has not yet spread anywhere else) I have read of the possible complications. My poor baby also has arthritis in his back hips. Do you think it is worth putting him through this? what would his life expectancy be if we did not do this surgery? ( firm nodular swelling around R lobe of thyroid measuring 3 x 4-5 cm. It has been determined to be cancerous . an ultrasound has been performed.)
Dec. 20, 2017
Given Cody’s age, I would be on the fence regarding surgery but think it would be best since a growing tumour may cause not just metastasis but also local problems too (compression of trachea or larynx). Life expectancy is a difficult question to answer since the ‘window’ is very wide and can vary by years; if the tumour is moveable and at this size would be a good candidate for a clean excision. Regards Dr Callum Turner DVM www.acvs.org/small-animal/thyroid-tumors
Dec. 20, 2017
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0 found helpful
my dog is around 12-13 years old. he has moles on his back. in the past week he’s had 2(possible) seizures but i’m not sure what they are yet. the first time it happened he was tense and peed himself. the second time he was completely flopped in my arms. he also has lumps in his throat. he’s not as good as holding his bladder and he has the runs.
Nov. 14, 2017
There are a few different possible causes for the seizures and other symptoms you are seeing; however if you are feeling lumps around Duke’s throat you should visit your Veterinarian for an examination to determine the origin and nature of the lumps to see if they are having an effect on Duke’s overall health. Some incontinence may be attributable to age, but may also be caused by tumours, hormonal issues among other causes. Regards Dr Callum Turner DVM
Nov. 14, 2017
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Jack Russell Terrier
1 found helpful
Hi my 12yr old jack russel terrier has just had his full thyroid removed it was a carcinoma cancer luckily there was no spread to his lymph nodes or his other thyroid but they couldn’t say for definite that it may have spread to his lungs he’s recovered amazingly he’s practically bk to normal we decided not to X-ray his lungs and just to watch and monitor him on a regular basis I’ve no idea what his life span is going to be for now we just making the most of him and giving him extra belly rubs etc it’s a worrying time and we are just praying it won’t return anywhere else we were told it’s a 65% chance it will return we hope he’s in the 35% and has a full life span
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