This section is from the book "British Dogs: Their Varieties, History, Characteristics, Breeding, Management, And Exhibition", by Hugh Dalziel. Also available from Amazon: British Dogs.
The first thing to be taught a house dog is habits of cleanliness.
It stands to reason that to ensure this the animal must be let out at regular intervals during the day, and this should be done both the last thing at night and first thing in the morning.
Regularity in feeding has also an excellent effect.
Whenever a dog offends it should be scolded or whipped and put out, care being taken that the dog knows what he is being punished for. When he learns to connect the offence with the punishment he will cease to offend.
If these lessons are persistently given, most dogs will learn to ash when they want to go out, by going to the door, barking, or otherwise indicating their wishes.
It is a good plan to have one certain place to feed the dog in, and bones should not be given in the house, or the dog will probably contract the habit of hiding them in inconvenient places.
Small dogs generally give a preference to a box or basket to sleep in, and something of the sort should be provided; but it is quite a mistake, even with the most delicate, to wrap them up in blankets, etc, as is often done. This makes them supersensitive to cold when taken out.
Pugs have naturally a thick, warm coat, although it is short, and do not require to be clothed; but the very thin-skinned Italian greyhounds and toy terriers should, except in very warm weather, be clothed when taken out of doors, and when at exhibitions.