The pelvic cavity is relatively long and narrow. The inlet is more
oblique than that of the horse; it is elliptical in outline, and the
transverse diameter is smaller than that of the horse. The anterior
(pubic) part of the floor is about horizontal, but the posterior
(ischial) part slopes upward and backward to a marked degree; this part
is also deeply concave transversely. The roof is concave in both
directions. The peritoneum extends backward as far as the first
coccygeal vertebra, so that the retroperitoneal part of the cavity is
short.