As soon as he eliminates, put him up. If he insists on marking prior to eliminating, crate him until he has to go. Use the same area for elimination each day, so the dog develops a habit of going in the area. Keep it fun, while developing drive and olfactory experience. Avoid fear producing incidents.
Age is critical in determining the type and amount of stress that a dog can safely carry.
Too much stress can cause a clinical neurosis. Neurosis and psychosis can be caused more readily in a dog with a weak central nervous system. Psychological trauma to a young dog who is still developing may cause irreversible damage. Dog needs nurturing from the dam and to be protected from environmental extremes. Continue nurturing, but allow some mild stress such as cold or short-term social isolation.