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In page Hyperthyroidism:

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Hyperthyroidism is much less common in dogs compared to cats.[1] Hyperthyroidism may be caused by a thyroid tumor. This may be a thyroid carcinoma. About 90% of carcinomas are very aggressive; they invade the surrounding tissues and metastasize (spread) to other tissues, particularly the lungs. This has a poor prognosis. Surgery to remove the tumor is often very difficult due to metastasis into arteries, the esophagus, or the windpipe. It may be possible to reduce the size of the tumor, thus relieving symptoms and allowing time for other treatments to work.[citation needed] About 10% of thyroid tumors are benign; these often cause few symptoms.[citation needed]