Awhile back I was talking to my buddy about my dogs flee problem and he told me about how wild wolfs control their fleas. First the wolf gathers a tuff of it's fur and holds it in it's mouth. Then it slowly starts walking into a body of water. The fleas keep moving up the wolfs body to the dry area. Eventually the wolf goes deep enough into the water that it's snout is the only part above water so the fleas move onto the tuff of hair and after a couple of minutes the wolf flicks the hair tuff out of it's mouth and no longer has a flee problem.
I grew up in a house that believed animals have no intelligence or feelings and they were only put here for the benefit of man kind. But I think the wolf thing proves animals can be quite cleave and I have seen many examples of how deep an animals feeling's can go. As far as animals being put here just for the benefit of man kind – I think it's like believing that there is no such thing as aliens because man kind is so special. Cheers and happy weekend!