Tomorrow my dog is being put down and I feel like shit

I can't hold it together. She has been with me through so many good times and bad times, for the past 14 years and tomorrow she won't be here anymore. Tonight she is sleeping next to me, in my bed, unaware about what will happen tomorrow.

She has cancer and it really started to get to her. She doesn't like us touching her stomach, since it will hurt and she have lost a lot of her hair.

This is so tough. I keep thinking that we should wait. Just one more day or one more week.