How can i get my dog dashchund to eat his dog food and not our cats cat food?

I have a dachshund about 12 lbs, and i have a cat. but he has been eating the dry cat food and not his dry dog food. ive gone as far as not giving him any wet food or treats but still he goes for the cat food. any suggestions? his fur is dry and i know he needs his vitamins for his fur and his health not to mention what its done to his teeth.