Well it is impossible to crossbreed cats and dogs because they just aren't closely related. Dogs can't even be crossed with foxes. (though they can breed with wolf,coyote or jackal)Cats are serious interbreeders when given the chance;all kinds of small-cat hybrids are known,as well as crossbreeds between tiger/lion and lion/leopard.
I don't think Hobbits were hybrids,though I like to think of Orcs as being twisted creatures with blood from all other humanoid races.
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Nothing is evil in the beginning,even Sauron wasn't
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