Keep this book in the medicine cabinet in the barn. Walk around the pastures with the book in hand, especially in late spring or early summer. Or pack it with on on a trail ride. It just might save your horse's life. The book is organized according to types of plants---trees, bushes shrubs and vines, ferns and plants, weeds and wildflowers and grasses and horsetails. Since visuals are very important for correct identification, clear color photographs are shown, including wherever possible a close-up photograph and line drawing to better identify each plant. Each plant is given two-pages. Common and scientific names are clearly stated at the top left page. The text on the facing page includes a concise description, geographic distribution and US map indicating those areas where growth is likely, what the horse's signs are of poisoning and what you should do. Most toxic plants are unpalatable to horses. But not all. They can be found in the field, mixed with hay or other feed. This book wisely cautions that prevention is the best cure. No horse owner should be without, including those who board their horses.