When your dog stops eating and walks away from the bowl, pick up any remaining food and dispose of it. At least four times a week feed your dog his entire meal from your hand. Have your dog perform a simple command for every part of his meal. If he tries to grab the food roughly from you, pull your hand away, give him a short time out, then offer the food again. If your dog refuses to carry out known commands, quietly put his food away until the next regularly scheduled meal.
Dogs sometimes use urination and defecation to mark their own territories.
If your dog is in the habit of marking during walks on lead, take control of his pee-mail. You may have to use a head halter to give you control over your dog's nose. Controlling the best spots to sleep is one of the games dogs play with each other to establish authority. As almost every dog could tell you, the best spots to sleep in any house are the furniture and human beds. If you are playing Mind Games because your dog lacks respect for you, prohibit your dog from getting up on the furniture and on your bed.