This book is a good resource for those with some experience in the use of homeopathic remedies. It's definitely not the first book on homeopathy you should be reading, as it will not tell you how to take a case, choose the most appropriate remedy, select potency and repetitions, and recognize signs of a cure or partial cure as well as the signs of suppression or a noncurative aggravation. For an excellent introduction to veterinary homeopathy, check out books by Dr. Don Hamilton and Dr. Christopher Day.
Dr. Macleod's book lists some of the major remedies for a large variety of canine ailments (arranged according to body system) with a brief description of the symptom picture that would call for a particular remedy. Of course the list of remedies is not exhaustive and this book is not intended to substitute for looking up the remedies in a comprehensive materia medica.