"A young dog of mine," says he, "was lost in London, and, being aware that if a noise was made about it, a great price would be asked for it, I gave out that I wanted to purchase one: I was shown my own dog. I seized it; but there were several scoundrels present who professed to belong to it, and threatened to kill the dog if I did not pay for it. I proceeded to describe it as my own, stating that it had 'bad back or double teeth'. Judge of my surprise when, after great difficulty, and the dog crying greatly, its mouth was opened, and all the back teeth had been taken out! I paid two pounds for it before they would let me take it away; but, in consequence of the injuries it had received, it died a few days afterward."] * * * * * INTRODUCTION TO CANINE PATHOLOGY. BY THE EDITOR. PREDISPOSITION TO, AND CAUSES OF, DISEASES IN DOGS.--THE CLAIMS OF DOGS UPON US. "Unnumbered accidents and various ills Attend thy pack, hang hovering o'er their heads, And point the way that leads to death's dark cave. Short is their span, few at the date arrive Of ancient Argus, in old Homer's song So highly honour'd." The dog from early youth, in fact oftentimes at the very period of birth, is exposed to many dangerous and troublesome affections, the result of causes not less complex and multifarious than those that exert an influence over the human organization. Many diseases are the consequence of their domesticity and the hereditary defects of their progenitors, others are dependent upon accidental circumstances, bad treatment, and improper nourishment. Not a few, however, of their most mortal maladies are the production of contagion, infection, and other like causes, all exercising a general tendency to disease difficult to define and impossible to avoid. Although every species of dog is more or less subject to certain diseases peculiar to their race, those breeds of most value and more particularly subservient to the will of man are liable to a greater number of ills and casualties than other dogs, for the reason that they are more frequently exposed to unnatural fatigue, extremes of heat and cold, as also to the various dangers dependent upon the chase of wild animals. Those diseases resulting from specific causes, either natural to the race or artificially produced by the animal itself in a state of morbid derangement, are most frequent and fatal, as witnessed in distemper, rabies, mange, &c. The intimate connexion existing between the diseases of our canine friends and those of the human race, as also the strong similarity in the action of many drugs over the two systems, render the study of one branch almost synonymous with that of the other.