True, but this wouldn't have happened if humans hadn't bred animals to a ridiculous point. Selective breeding has raised all manners of health issues in farm animals such as pigs, cows and chickens. Pigs shouldn't be overweight, bald and lazy, that's the effect of selective breeding. Cows also shouldn't be so ridiculously overweight, and shouldn't be producing such vast quantities of milk.
If these animals could live a natural life they'd be fine, but the effects of selective breeding, over-feeding and hormones will always be there. Cows and pigs would be okay if they returned to an ordinary weight, and weren't fed with so chemicals and hormones.
This is a healthy-ish pig: http://www.clipart.dk.co.uk/DKImages/farm/image_farm004.jpg
Now compare that to this: http://s3.amazonaws.com/picable/2010/07/02/1950242_A-Big-Fat-Pig_620.jpg
Or this: http://farm4.static.flickr.com/3071/2937420329_3b85bfed29.jpg
Pigs are quite clean animals by nature. Do you think they enjoy wallowing around in their own feces?
Here's a healthy cow: http://farm1.staticflickr.com/160/385648030_edad6436b3_z.jpg?zz=1
Now look at this: http://2.bp.blogspot.com/-Luku0JGtUpw/T8Y91cx-mZI/AAAAAAAAGYY/cqH5BTSgjIE/s1600/fat_cow.jpg
Or this: http://images4.wikia.nocookie.net/__cb20091015184859/uncyclopedia/images/9/9f/Fatcow.jpg
If livestock were returned to a healthier state before being released into the wild they'd do fine. I don't have an issue with foxes or wolves hunting, but I do have an issue with how incredibly sick the dairy and meat industry is.
Edit: Of course, humans could always use selective breeding to attempt to return these animals to their former glory.
Edit: @Yuki Asakura, you can't ignore an entire argument on the basis that you think it's 'mad'. It's ******* stupid, and just makes you look like a little whiny **** wit.