Abused animals react the same as you would, if abused. When they've received more mistreatment than they're capable of handling, they explode as you would in the same situation. Some people live with these beasts in their homes with no ill effects whatsoever. In fact, owners and pets are quite devoted to one another. The animal doesn't reason that someone took something from him and, therefore, should have to pay for his cruelty.
Animals act through their instincts for survival.
If a species has been threatened enough times, the members develop a new instinct that will enable them to survive. If you have a hard time believing that all the fauna were once your friends and helpmates, ask if you have a hard time believing that of people as well. Animals began to feel differently about the blessedness of energy when you did. The beasts of this Earth aren't going to find a healthy existence until you find your own. God senses your widespread hope for the end of cruelty, but creating this blissful co-existence isn't about changing your eating habits or protesting the meat industry.