Thyroid tumors comprise 1.2-3.8% of all tumors in dogs and the majority (about 90%) are found to be malignant (known as thyroid carcinoma or thyroid adenocarcinoma). Breeds that have a higher risk of developing this type of cancer include Beagles, Boxers and Golden Retrievers although any dog can develop a thyroid tumor. Most dogs with thyroid tumors are older (>10 years). Clinical signs The most common sign is the finding of a mass in the neck. In most cases, these tumors are present on only on one side of the neck (unilateral) but there is a small percentage of dogs
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