TiaCat,
You will learn how to live without your precious girl, but it will take some time. You will still have to work out all those guilt issues that everyone here struggles with after they chose euthanasia as the best option for their furbabies. There will be the feelings of 'what if', I should've', 'I could've'...truth be told, if your vet could
feel a mass in your Misty's belly, then you can be sure that you did the right thing for her. There are so many people who can't afford the outrageous costs of all the tests and treatments required in such a situation and then have to live with that feeling of failing their babies because of money alone...that mass was surely cancer and no test or treatment would be able to cure it, so the outcome in her best interest would remain the same...I hope you can at least put that part of the grieving process behind you. You took Misty in as a homeless baby and provided her with 8 years of love and devotion that she would have otherwise never known, that is the part that you need to focus on. You did a wonderful thing by caring for her all that time, and an equally wonderful thing for loving her enough to end her suffering.
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How can I go through this again with another animal?
Some people feel that they will never have another furbaby after they suffer such a loss, then others (like me) couldn't imagine a day going by without having a furbaby, it is a personal decision. {Although I would like to say that this world is filled with animals that are dying everyday because there aren't enough homes for them all, so if you do decide to get another, please rescue

) In time you will find that the love and joy you received from Misty was well worth the pain of saying good-bye (for now).
Let yourself scream, let yourself cry, even if it feels like it will never stop...it will, and you will feel so much better. Tears are cleansing and they will actually make you feel better..I know mine do. It is going on 2 years since I lost my Sasha, my soulmate, and I still cry from time to time....I always feel a little better afterward....
Thank you for giving Misty such a wonderful life

...so many homeless kitties will never know how that feels........
your friend in grief,
Kim