I thought my dog Sheba was going to leave me suddenly a few months ago, with her bone cancer. I know how you feel. Luckily Sheba is still with me for now thanks to chemo, but I know that feeling is just around the corner waiting to come back.
I'm sorry that you are faced with it.

When it happened to me, I spent the entire weekend in tears. Then I decided I had to toughen up for her and I took her for lots of walks (her favourite thing in the world.)
I took my camera and took photos of her playing on her walk and then I even video recorded her walking. From the lead down to her, as if I could watch it again and it would look like I was walking her again.
Sounds a bit funny I know, but it was her and my fav thing to do together and we had a lot of bonding and I grew up walking her. So I don't want to lose that. I just took a few videos of her walking infront of me.

She is quite a sooky girl and looks quite miserable just sitting around at home, so for her.. it was to be out and about. Then the horrible weather hit but now she's just enjoying sleeping on the bed with me. She is spoilt.
Think about the important things with your baby and find a way to hold on to them when they are gone.
I bought Sheba a new collar earlier in the year (before any hint of illness) I just wanted to know that when she did go, she would have a lovely collar for me to put on my dresser..
....... oh this is a sad thread.
I feel for you, I hope you are both okay. What a horrible part of our lives.