The cat does not need the dog. The cow is rough. The dog is green. The mouse eats the dog. If the dog needs the cow then the cow chases the dog. If something chases the cat then it does not chase the dog. If something is red and it chases the cat then it eats the dog. If the dog eats the mouse then the mouse eats the dog. If something chases the cat then it is red. If something does not eat the dog then it is green.
The cat needs the dog.