Sebaceous gland tumours were diagnosed in 54 dogs through cytological and histopathological examination of samples obtained from tumour-suspected masses. Among these, sebaceous gland adenomas accounted for 24 cases, while sebaceous gland adenocarcinomas comprised 30 cases. In the breed, sex, age, and anatomical location-wise analysis, the highest incidence of sebaceous gland adenoma was recorded in Labradors, male dogs, within the 5–10 years age group, with a predilection for the limbs. Similarly, sebaceous gland adenocarcinoma showed the highest occurrence in Labradors, male dogs, of the same 5–10 years age group, but were more commonly located on the trunk and ears. Sebaceous gland adenomas exhibited clusters of neoplastic basal cells with round to oval nuclei, finely stippled chromatin, and vacuolated cytoplasm resembling mature sebocytes cytologically, and in histopathological examination, revealed clusters of neoplastic cells arranged in multiple lobules and basophilic reserve cells with hyperchromatic nuclei. Sebaceous gland adenocarcinomas revealed variably sized cell clusters with hyperchromatic nuclei, coarse chromatin, and foamy cytoplasm cytologically, and in histopathological examination, lobules of variably sized neoplastic cells exhibiting anisokaryosis, vesicular nuclei with prominent nucleoli, and frequent mitotic figures were seen.