The cat chases the dog. The cat is big. The cat is cold. The cat is green. The cat is nice. The cat is round. The cat needs the dog. The cat visits the dog. The dog chases the cat. The dog is big. The dog is cold. The dog is green. The dog is nice. The dog is round. The dog needs the cat. The dog visits the cat. If someone chases the cat and they chase the dog then they need the dog. If the cat needs the dog then the cat chases the dog.
The cat does not need the dog.