You can download Handbook of Small Animal Radiological Differential Diagnosis by Ruth Dennis, Robert M. Kirberger, Robert H. Wrigley and Frances Barr free in pdf format.
This is the veterinary version of Aids to Radiological Differential Diagnosis by Chapman and Nakielny. The main aim of the book is to provide lists of differential diagnoses for radiological signs to help practitioners with logical interpretation of radiographs. Because the level of radiological knowledge and expertise of veterinary general practitioners is relatively low (compared with specialist radiologists), each chapter begins with a description of normal radiographic appearance. In order to help practitioners plan how to narrow down a list of differentials or confirm a diagnosis, suggestions for contrast studies and further diagnostic tests are listed. There is a smaller chapter on ultrasonographic signs which is structured in the same way as the radiology section. Another chapter gives lists of the radiological and ultrasonographic features of a selection of common conditions.