The bald eagle does not need the bear. The bear needs the bald eagle. The bear does not need the dog. The bear visits the bald eagle. The bear visits the dog. The dog is green. The dog needs the bear. If the bear chases the dog and the dog does not need the bear then the bear is young. If the dog chases the bald eagle and the bald eagle chases the bear then the dog needs the bald eagle. If someone does not visit the dog then the dog does not visit the bald eagle.
The dog does not need the bald eagle.