I'm so sorry for your loss! My beloved Reilly passed away Nov. 29. While she was older than your Coco, it was still unexpected, and the silence in the house is difficult to bear, at times. I understand your connection with Coco--I felt as if I lost a child when I said goodbye to Reilly.
I've found some comfort in writing down my memories of her (but I haven't gone back to read them, yet) and looking at her photos every day, but I still feel empty when I look in the backyard or drive past the park where we took our daily walk.
I hope that your wonderful memories of your time with Coco help, at least a little, and know that love never dies.