The present study was carried out on 28 clinically ste healthy adult dogs of both sexes. They were divided into four equal groups. Dogs of the first and third groups were subjected to 30% & 40% partial hepatectomy by the excision of the left lateral lobe and left lateral as well as left central lobes respectively. Dogs of the second and fourth groups were subjected to 30% and 40% cholecystilobectomy respectively. Regeneration capability was estimated in all groups by calculation of regeneration percentage. It was 31.10, 36.00, 42.76 and 45. 40% in the 1, 2, 3 and the 4 groups respectively. In spite of higher regenertion percentage in case of cholecystilobectomy groups than those of corresponding partial hepatectomy ones, there was no significant difference between the cholectystilobectomy and partial hepatectomy in regeneration percentage.