The pelvis can be thought of as a rectangular box of bone connecting the spine to the back legs. It holds all of the important muscles for locomation and allows weight to be transferred from the legs to the spine. Fractures of the pelvic bones (ileum, ischium, pubis, sacrum) are common after blunt trauma such as a car accident. The reasons for your local vet to refer you to a specialist surgeon would include: severe pain, involvement of the hip joint, breaks on the left and right sides and collapse of a segment of bone causing narrowing of the pelvis. Some minor fractures can be effectively managed with cage rest for 6 weeks. Surgical repair should be performed by an experienced vet who has ample time and advanced equipment. There are a range of implants that are used to repair these breaks as you can see below. The outcome should be very good and pets should enjoy a relatively normal pain-free life after pelvic fracture surgery. The chest and abdomen should also be checked (x-rays, ultrasound, CT scan) for additional injuries if you know your pet has been hit by a car at high speed.