We recently purchased a one year old doberman male pup (not desexed) from a lovely family that were moving away. We have another male 4 year old dog desexed they seem to have settled in nicely. We have a two storey house with tiles underneath and a metre wide cement edging around the outside. My doberman has started pooing on the cement quite regularly and I don't want this to become a habit when he is older. how can you stop your dog from doing this?