Your dog may be ok. But your mum definitely won't, she will live with the questions and guilt of not being able to help (why didn't you talk to her) for the rest of her life and she will never be quite the same again. Please talk to someone about how you feel. Your mum would be a good place to start. But anyone with compassion who will listen is better than keeping silent. If you end your life things can't get better. You won't always feel this way. Life is precious. Go to a hospice for the terminally ill and then tell yourself that life isn't the most precious thing we have. Please seek help, your life matters..you matter. Don't do this to yourself or to your mum.
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