After proper feeding, comes exercise as the next most important element in preserving health. Exercise, and plenty of it, is the lot of the dog in his natural state. The wonder is how he manages to live so long when shut up for hours together in a warm close room, and not permitted to use his limbs or breathe fresh air, except, perhaps, under considerable restraint. A host of diseases can be traced to want of exercise, aided by improper dieting. To prevent these and to keep the dog in a sound state, daily exercise is essential. Puppies will exercise themselves if taught to play with a ball. Larger dogs are more disposed to exert themselves in company than when alone, - playing and frolicking with a companion. In older age there is less disposition to playfulness, and it may be necessary to take the animal out to enjoy a formal walk; but there is no circumstance of health prohibitory of exercise in some form or other.

House-dogs should be allowed to leave the house several times a-day, for the performance of certain natural acts, and to preserve cleanliness. If this be neglected, well-bred dogs will restrain their natural desires, and may thereby do themselves serious injury.