The dog is rough. The squirrel chases the dog. If something likes the dog then the dog is rough. If something needs the dog and it chases the dog then the dog chases the squirrel. If the dog chases the squirrel then the squirrel chases the dog. If the dog chases the squirrel then the dog likes the squirrel. If something is red and it needs the dog then the dog is rough. If something chases the dog then it likes the squirrel.
The squirrel needs the dog.