In the years which have elapsed since I first wrote upon dogs, there has been a wonderful advance in veterinary science and practice. Operative surgery under anæsthetics has become nearly as confident in relieving our pets as in abating our own miseries. Much disease, however, is still present among dogs for which there is no warrant in Nature, and which might be entirely conquered in the course of a few generations, could the prejudice against natural and rational diet be completely abandoned.