
I think the owner has misunderstood the procedure of how the x-rays are taken.
The legs are pulled straight and rotated, if the hips were dislocated the dog would have a terrible score as a dislocated hip would score 53 per hip.
The procedure notes here:
http://www.bva.co.uk/public/chs/HD_PNs_2008.pdf explain things.
3.2 Positioning
A standard position for radiography must be employed. Accordingly:
(a) the dog should be placed on its back with the pelvis in the middle of the cassette and the x-ray beam centred on
the midline between the hips (ie the centring point should be at the level of the cranial edge of the pubis);
(b) in order to avoid rotation, the head and body should be supported in a straight line by a cradle or by blocks at
the thorax. Tilting of any part of the dog's body is likely to cause axial rotation of the pelvis and asymmetry of
the hips;
(c) the hind legs should be FULLY extended and adducted so that the femora lie parallel to each other and parallel
to the film;
(d) the legs should be inwardly rotated so that the patellae lie centrally in the trochlear grooves;
(e) suitable ties or tape should be used to achieve correct adduction and inward rotation; poor positioning which
allows either lateral or longitudinal tilt of the pelvis may prevent accurate radiological assessment of the hips;
(f) if the radiograph shows axial rotation of the pelvis, this may be corrected by raising the hip on the side on which
the image of the obturator foramen is smaller.
Barbara and the Grey Curly Tails.