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First, what a searing and lovely response to this letter, Carey.
To those who are using the mantra "it's a dog, not a person" to excuse the mistreatment of an animal, I'd like to respond. Dogs have simpler needs than humans: food, fresh water, fresh air and exercise, and love. If you choose to have a animal (either actively or passively, by entering into a relationship with someone with a pet) it becomes your responsibility to provide for the animal as you would provide for any other being dependent on your for its survival. Because it is an animal does not mean it is less deserving of its basic needs in life.
If you are unable or unwilling to provide for your animal's needs, it is your responsibility to find someone who is able or willing. It's just humanity.