Are there any owners here with experience of Canine Cancer? 
I shall try to be coherent, but my brain is addled, so apologies in advance if i am not..
My 9 year Golden Retriever has been off his food for 2 weeks, and getting out of breath a bit, but on Tuesday night he suddenly couldn't get up to do his last wee.
The vet came out, and we thought he may have a blockage as he's a one for chewing things. I immediately took him in for X rays.. we discovered he has a tumor in his Spleen, and it is in the very early stages in his lungs 
It has happened so fast, i'm devastated, i thought he'd just got bored of his dog food as he eats everything else.. I am trying to not be sad around him, because i don't want him to pick up on it. He watches me like a hawk, and has always known when i'm ill etc..
I decided to go the Steroid route, and he's eating lots again, although i have to do little and often, as his tummy is squished. We rest a while when he starts getting out of breath on our walks (which i'm now doing for much shorter times and avoiding up hill) and i don't leave him alone for any length of time, as he seems scared..
Does anyone have any advice on what else i can do?
Just needed to write this down, i don't know how i'll cope without him..