Sentence:  And gruesome they areː We find cattle still alive with hindquarters <WSD>chewn</WSD> off, still alive with their eyes <WSD>chewn</WSD> out, their ears <WSD>chewn</WSD> off, their noses and faces <WSD>chewn</WSD> till they look like (a) Hamburger, their tails hanging in shreds. Or, we find them after a slow and cruel death. Can you understand why cattlemen will shoot YOUR dog if he is seen wandering on ranchland? 
Meaning of the word marked with <WSD> tags:  To crush with the teeth by repeated closing and opening of the jaws; done to food to soften it and break it down by the action of saliva before it is swallowed.