AKC Standard:

Hindquarters-The strong, powerful hindquarters have moderate bend of stifle and short hocks perpendicular to the ground. The legs are parallel when viewed from behind. The hindquarters are in balance with the forequarters. The thighs and buttocks are full and muscular. Feet as in front.

Clarification: Pugs should have strong, powerful hindquarters. They should have large, full, muscular thighs and buttocks with a moderate bend of stifle and short hocks. The hocks should not extend much beyond the point of the rump and should be perpendicular to the ground. Viewed from above,the rear should be approximately as wide as the shoulders.

Undesirable:Straight or exaggerated stifles; fine or overdone bone; legs too short or too long; cow hocks; toeing in or out; thin thighs; narrow rear; (pearshaped ).