My god, that was horrible. It breaks my heart that people can do this, and I can't think up a punishment fitting enough. Disgusting.
Also disgusting is the attitude of some people on the forum underneath, who have that "eye-for-an-eye" attitude...So it's OK to mutilate and murder a dog because it bit/fought? It's due to the cruel, vindictive nature of humans, not dogs, that incidents like this are so common.
I agree that some breeds are bred for certain things, and that if this isn't channelled it can be outleted in negative ways (my Collie tries to chase tractors, lawn mowers, street sweeping machines, mopeds, his own tail!), but people need to see past this and recognise that it's deed, not breed, that should mark a dog's character. If the dog had bitten/attacked, there are HUMANE ways of dealing with this-putting down, if necessary. There is NO justificiation for this maltreatment.