There are 2 people out there that want to care for her whether he does or not. Doing the right thing in this situation is not killing her in a horrendous tortuous manner, but divorcing her and giving her up to those who do care, the next best thing would be to put a gun to her head and be honest and quick about killing her. We put dogs out of their misery in a nicer manner than they are going to make her die.
We would never let a dog linger in the condition she is in. We put animals out of their misery.