The bear chases the cow. The bear chases the dog. The bear needs the cow. The bear needs the dog. The cow chases the dog. The cow needs the bear. The cow sees the dog. The dog is green. The dog needs the bear. The dog sees the cow. If something chases the dog and it needs the cow then the dog does not chase the bear. If something is kind then it needs the cow.
The cow does not need the bear.