The entire rear assembly in a dog is the engine that propels it forward. Stephanie and Laura unpack the anatomy and biomechanics behind a correct rear assembly, why balance matters more than any single piece, and how faults in the rear (or the front) can break a working dog down over time.

The Rear as the Engine Stephanie describes the rear as a pole vault mechanism, driving the dog over its front assembly. The pelvis, sacral vertebrae (three fused bones), and hip joints form a solid, interconnected unit — and understanding how they work together is key to evaluating any breed.

Croup Angle and Tail Set The croup's angle determines tail set and follow-through. A steep croup lets a dog reach far under itself but limits follow-through — the dog picks its foot back up instead of pushing off completely. A high tail set (Stephanie's memorable test: can you see the dog's anus from behind?) produces a tail that curls over the back and signals a structural problem, not just a cosmetic one.

Hock Length: Short Isn't Always Better Not every breed needs a short hock. Whippets need length to generate speed. Corgis need enough leg to cover ground. The right hock length always comes back to the question: can this dog do the job it was bred to do?

Bend of Stifle and Sickle Hock Too much bend in the stifle often produces an overly long rear pastern and a sickle hock — the dog can't stand square and loses its ability to push off effectively. Handlers may be able to mask it on the stack, but the dog's movement tells the truth.

Why Balance Is Everything A dog that is straight both front and rear tires quickly but stays sound. A dog with a strong rear and a straight front is the most problematic combination — the front, held together only by muscle and ligament, will break down under the stress the rear generates. Movement is the proof of structure, and slowing a dog down in the ring often reveals problems that a fast gait conceals.

Breadth, Loin and Feet Stephanie and Laura also cover the importance of croup width (muscling and power), loin strength and length, and breed-appropriate feet — reminding listeners that every element of the standard exists because it helped a dog perform its original function.