Abstract: In this study,the appearance and tissue structure of canine ovary in different reproductive stage were observed. The results showed that: the volume of canine ovary from follicular stage,corpus luteum stage and anestrus stage were 812.63 mm³,1081.80 mm³ and 446.03 mm³,corpus luteum stage was significant higher than follicular stage and anestrus stage (P<0.05),follicular stage was significant higher than anestrus stage (P<0.05). The weight of canine ovary from follicular stage,corpus luteum stage and anestrus stage were 0.89 g,1.14 g and 0.71 g,follicular stage was lower than corpus luteum stage,and was higher than anestrus stage,there was no significant difference(P>0.05). In the follicular stage ovary,a great quantity of secondary follicles and a small quantity of mature follicles were seen. In the corpus luteum stage ovary,a small quantity of secondary follicles and atretic follicles were seen,and there were a great quantity of corpus luteums. In the anestrus stage ovary,the main category of follicles were primordial follicle. As above mentioned,the appearance and tissue structure of canine ovary were concerned with reproductive stage.

Key words: Canis familiaris; reproductive stage; ovary; histology