The degeneration of intervertebral disc was observed more clearly in 2-3 year-old than in 1-2 year-old or less than 1 year-old Pekingese.

• 组织学观察,1岁龄左右及之前小日龄北京犬椎间盘纤维环结构完整,未见到断裂溶解现象,组织学变化主要集中在髓核和软骨终板上。