Block of a small section of the kennel with a partial wall and put wood shavings (not cedar) on the floor area in the small space you made. If he still doesn't use this try placing some of his droppings or a rag with his urine on it in the shavings. Just remember a dog doesn't like to do his business where he lives and if he is in that kennel for 6-8 hrs. that's where he lives.