The number and variety of parasites that make one part or another of the dog their habitat is very great. These are divided into external and internal; in the former two distinct mites, producing two very distinct forms of the mange, have already been referred to, and the internal parasites are treated under Worms.

There is no dog owner of much experience who is not aware that great care and cleanliness are needed to prevent the introduction of these unwelcome visitors, or who has not had to pay smartly for their extermination, if his kennels have been neglected. The parasites to which I particularly wish to direct attention are three in number - the louse, the flea and the tick - which now follow in order named as to treating.