You can teach him at that moment that going potty in the house doesn't feel as good as going outside. (thehousebreakingbible.com)
Please remember that your puppy is not going potty in the house on purpose but because he or she doesn't know any better. (thedrakecenter.com)
To prevent your small dog from going potty in the house, do not make the biggest potty training mistake of many novice puppy owners: giving too much freedom at once. (dailydogdiscoveries.com)