['My cat has to be put down next week.', "Oh no!  I'm so sorry, we just went through that with our pup.  It's a hard choice to have to make.", 'She has been sick for a month and is not improving.']
I'm sorry you are having to make that choice, but I feel it's our duty to them to help them pass on when they are not going to get better and help them not suffer any longer.
My cat has to be put down next week. She has been very sick for a month and not improving.