It is best to start training since puppy:
1. Firstly, select an appropriate fixed place for defecation which you can put the collected puppy feces.
2. Bring your puppy to the place where the defecation is deposited in a regular time and stay for a while.
3. If your puppy defecates there, you should give caressing or snacks rewards. If the frequency is higher, the puppies will voluntarily defecate here.
4. If your puppy defecates in other places, it must be rigorously trained and punished. After that, you should lead your puppy to selected fixed place to stay. After some training, you puppy will automatically defecate at right place.