08/15/2026
This is extremely common with raw diets. Especially those made by people who don’t know how or bother to formulate blends.
Feeding neck bones and muscle meats around the neck will drastically increase iodine which is directly related to thyroid health.
And yes it’s easy to address. If your dog is raw or fresh feed and has high thyroid levels and your vet thinks it’s hyperthyroidism, lower the amount of neck raw meaty bones and such.
If you’re buying a blend from your local farmer or other raw dog food companies, ask questions. If they can’t give you 100% transparency, don’t feed it.
What do I practice for my dog food? Muscle meats not from the neck region, never ground neck bones, iodine is sourced from kemp which is formulated to meet NRC standards with lab certified nutritional values.
If your DIY and feed neck bones, maybe only feed 1-2 per week and only add kelp to meals a few days after a neck bone.
A 7-year-old Bull Terrier was evaluated for a 𝗳𝗶𝘃𝗲-𝗺𝗼𝗻𝘁𝗵 𝗵𝗶𝘀𝘁𝗼𝗿𝘆 of increased drinking and urination, panting, restlessness, and weight loss despite a good appetite.
Testing revealed 𝗶𝗻𝗰𝗿𝗲𝗮𝘀𝗲𝗱 𝘁𝗼𝘁𝗮𝗹 𝘁𝗵𝘆𝗿𝗼𝘅𝗶𝗻𝗲 (𝗧𝟰) and a markedly low 𝘁𝗵𝘆𝗿𝗼𝗶𝗱-𝘀𝘁𝗶𝗺𝘂𝗹𝗮𝘁𝗶𝗻𝗴 𝗵𝗼𝗿𝗺𝗼𝗻𝗲 (𝗧𝗦𝗛) concentration, consistent with 𝘁𝗵𝘆𝗿𝗼𝘁𝗼𝘅𝗶𝗰𝗼𝘀𝗶𝘀 (𝗮 𝗰𝗼𝗻𝗱𝗶𝘁𝗶𝗼𝗻 𝗰𝗮𝘂𝘀𝗲𝗱 𝗯𝘆 𝗲𝘅𝗰𝗲𝘀𝘀𝗶𝘃𝗲 𝗹𝗲𝘃𝗲𝗹𝘀 𝗼𝗳 𝘁𝗵𝘆𝗿𝗼𝗶𝗱 𝗵𝗼𝗿𝗺𝗼𝗻𝗲𝘀 𝗶𝗻 𝘁𝗵𝗲 𝗯𝗼𝗱𝘆). However, CT and thyroid scintigraphy found 𝗻𝗼 𝗲𝘃𝗶𝗱𝗲𝗻𝗰𝗲 𝗼𝗳 𝗮 𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝗮𝗹 𝘁𝗵𝘆𝗿𝗼𝗶𝗱 𝘁𝘂𝗺𝗼𝘂𝗿.
𝗧𝗵𝗲 𝗶𝗻𝘃𝗲𝘀𝘁𝗶𝗴𝗮𝘁𝗶𝗼𝗻 𝘁𝗵𝗲𝗻 𝘁𝘂𝗿𝗻𝗲𝗱 𝘁𝗼 𝘁𝗵𝗲 𝗱𝗼𝗴’𝘀 𝗱𝗶𝗲𝘁.
The dog had been eating a commercially available 𝗿𝗮𝘄 𝗺𝗲𝗮𝘁-𝗯𝗮𝘀𝗲𝗱 𝗱𝗶𝗲𝘁, and the onset of clinical signs coincided with the introduction of the food.
A sample of the diet was tested and found to contain 𝟱.𝟭 μ𝗴/𝗴 𝗼𝗳 𝗶𝗺𝗺𝘂𝗻𝗼𝗿𝗲𝗮𝗰𝘁𝗶𝘃𝗲 𝗧𝟰—almost 𝘀𝗲𝘃𝗲𝗻 𝘁𝗶𝗺𝗲𝘀 higher than the maximum dietary concentration suggested by the analysing laboratory (less than 𝟬.𝟳𝟱 μg/g). Microscopic examination also identified 𝘁𝗵𝘆𝗿𝗼𝗶𝗱 𝘁𝗶𝘀𝘀𝘂𝗲 in the food.
The dog was switched to another diet with a much lower measured T4 concentration. 𝗪𝗶𝘁𝗵𝗶𝗻 𝟲𝟬 𝗱𝗮𝘆𝘀, the polyuria/polydipsia and restlessness had resolved, body weight had increased, and thyroid hormone results showed recovery.
The findings strongly supported 𝗳𝗼𝗼𝗱-𝗶𝗻𝗱𝘂𝗰𝗲𝗱 𝘁𝗵𝘆𝗿𝗼𝘁𝗼𝘅𝗶𝗰𝗼𝘀𝗶𝘀 caused by exposure to thyroid hormones in the diet.
This case is a reminder that when a dog shows signs and laboratory findings consistent with thyroid hormone excess—but no functional thyroid tumour can be identified—𝗮𝗻 𝗲𝘅𝘁𝗲𝗿𝗻𝗮𝗹 𝘀𝗼𝘂𝗿𝗰𝗲, 𝗶𝗻𝗰𝗹𝘂𝗱𝗶𝗻𝗴 𝘁𝗵𝗲 𝗱𝗶𝗲𝘁, 𝘀𝗵𝗼𝘂𝗹𝗱 𝗯𝗲 𝗰𝗼𝗻𝘀𝗶𝗱𝗲𝗿𝗲𝗱.
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