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The interactive dog atlas · Exterior and regions · Trunk

Croup regio sacralis

The croup is the region above the pelvis, toward the tail. It extends from the front edge of the pelvis to the base of the tail.

Open in the interactive atlas Guide: Exterior Worksheet

Educational material, not a diagnostic tool. Written by the Mantrailing România team from veterinary sources we read. Updated 14.11.2026.

Dog in left lateral view — exterior, muscles, skeleton and organs Vector study after the Ellenberger, Baum and Dittrich plates: a standing dog, head to the left, deep chest and digitigrade limbs. The four layers use the same contour: exterior with body regions, superficial muscles, skeleton and organs.
  1. Croup
  2. Lumbar region (loin)
  3. Tail
  4. Thigh
Croup on the atlas drawing, "Exterior and regions" layer, with the neighbouring structures. Left lateral view, after the Ellenberger, Baum and Dittrich plates.

Where it is

From the front edge of the pelvis to the base of the tail.

System
Body regions
Region
Trunk

What it is and what it does

The croup is the part of the back above the pelvis, from its front edge to the root of the tail. Beneath it lies the sacrum, the three fused vertebrae to which the pelvis attaches. The slope of the croup influences the angle at which the tail is carried and the way the hindlimb pushes.

Names

  • Also called: sacral region, rump.
  • Latin term: regio sacralis.
  • In Romanian: Crupa (Romanian page).

In the atlas lessons

How to measure, how growth works, what the coat is (5 min):

Body length, in FCI standards: from the point of the shoulder to the point of the buttock. Back length, from the withers to the base of the tail, is a different measurement, used by some standards and for dog clothing.

Questions from the atlas

"Find it on the drawing" questions whose answer is this structure; in the atlas you will find them in the question bank and in the lessons.

Guides it appears in

From the same region: Trunk

All structures, in the atlas · Flashcards: exterior and regions