Though dogs and cats area traditionally viewed as adversaries, they can actually make great companions for one another. Bringing a feline into a canine household-or vice-versa-can be trying for both animals and owners, so here's a technique worth trying: Keep your dog on a leash and give him food treats for sitting quietly as the cat walks by. This way, you're rewarding Fido for non-predatory behavior.
Be sure to keep your cat's claws trimmed, so that if trouble does arise, it can't do much damage to the dog.