Primary hyperparathyroidism (PHP) is rare in dogs. Mainly functional solitary parathyroid adenoma causes hypercalcemia due to excessive autonomous secretion of parathyroid hormone (PTH). PHP can be diagnosed based on serum calcium phosphorus, ionized calcium and PTH, and cervical ultrasound provides important information about the number size and location of parathyroidal lesion. Ultrasound guided intralesional ethanol injection has been used as an alternative to surgical treatment of PHP. In this case, PHP was diagnosed in 12 year-old Pug with clinicopathologic examination and cervical ultrasound, and the parathyroidal mass was ablated successfully through ultrasound guided ethanol injection.