Using puppy pads:

It's a great way to get your dog used to peeing in one place, once they have learnt to pee on the pads you slowly move them towards the back door, once they are a happy to pee by the back door they learn that when they go out that's the place to pee. It is still best to keep the puppy pads indoors just in case of little accidents. Once they start to ask you to go out side to toilet you have cracked it.

Also ideal for older incontinent dogs, they also learn that this is a place where they can wee. 

This product

• Includes 80 regular, heavy duty absorbency pee pads for dogs
• 5-layer construction; super absorbent core turns liquid into gel on contact.
• Quick-dry surface with built-in attractant for potty training; leakproof plastic lining keeps floors safe from damage
• For indoor/outdoor/car use; suitable for puppy training, assisting older dogs or as an alternative when outdoor is not an option
• Pad dimensions: Regular pads measure 22 x 22 inches or 56 x 56 cm (L x W); centre pad measures 19 x 19 inches or 48 x 48 cm (L x W) with a 1.5-inch (4 cm) plastic border on all sides to help prevent overflow