person A: My cat has to be put down next week.
person B: Oh no!  I'm so sorry_comma_ we just went through that with our pup.  It's a hard choice to have to make.
person A: She has been sick for a month and is not improving.
person B: I'm sorry you are having to make that choice_comma_ 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.