Puppies cannot and should not have the run of the house, they are often still in the process of toilet training and lack impulse control to stop themselves getting in to mischief. Confinement training will help your keep your puppy safe and help you to manage their behaviour in the home.
The best way to confine your puppy is to set up a small area within the home where your puppy can be safe. Setting up a space inside allows your puppy to still feel part of the family and also gets them used to short periods alone as you come and go from their view. It also gives your puppy a safe place to rest. Baby gates, puppy play pens and crates are all good confinement options that you can use indoors.
Getting your puppy used to confinement takes preparation. Always give your puppy something to eat when you confine them so they start to associate confinement with enjoyable things. If your puppy starts to cry after you put them away do not bring them back out until they stop crying. A baby puppy will need to be let out of confinement every hour or so during the day and a couple of times over night to toilet.
Confinement training will also help with toilet training, (so long as you have not purchased your puppy from a pet shop) they will be very reluctant to wee and poo in their confinement space and will cry to be let out for toileting. This teaches young puppies to hold on and sets them up well to toilet outside.
Anytime your puppy is out of their confinement space they must be actively supervised, someone must be watching or interacting with your puppy. If the phone rings or you need to get ready for work your puppy should be confined. Using this method to house train your puppy allows you to live your life around your puppy without them learning bad habits and without you feeling like you need to be puppy training all day long. Also, if you need a break from your puppy use the confinement area.
You will not have to use confinement for ever, the purpose of confinement training is to give your puppy a safe place to live during their impulsive years. Once your puppy matures enough to be trusted loose in the house they should be given more freedom.