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The article focuses on the prevalence of hypothyroidism in dogs especially in sighthounds, which is the ancestral group of the greyhounds. It mentions that the diagnosis of hypothyroidism requires the presence of clinical signs that resolve with appropriate therapy. It suggests that hypothyroidism is diagnosed in sighthounds based on low concentrations of serum thyroid hormone. Moreover, the serum thyroid-stimulating hormone (TSH) differentiates euthyroid sick syndrome from true hypothyroidism.