We now know that animals have mental capacities close to our own, differing only in degree. There is no reason, then, to believe that these capacities cannot become impaired. Sometimes, mental illness in animals resembles our own; at other times, it is very species-specific. Humans may even be the cause of theur suffering (we aren't always the greatest allies). But what, exactly, is "madness"? In this book, Michel Kreutzer gives us an overview of zoopsychiatry, demonstrating that the continuity between "normal" and "pathological" in both humans and animals is no easy thing to establish.