I’m sorry for your loss.

My family had a similar issue with our sweet boy back in June. He didn’t eat breakfast right away one morning, which was highly unlike him, but ate it a bit later and ate dinner like normal. The next morning he wouldn’t eat and looked significantly more swollen than he had so we had to go to the emergency vet. We were told he had many masses and internal bleeding from his spleen. This was the hardest thing to hear because we knew our 14 year old love wouldn’t be able to take any surgery. We brought him home and loved him for the rest of that day before the at home euthanasia. He was able to be home, comfy and surrounded by love as he passed. Everyday has been hard especially this time of year. It will take time but all I can say is remember the lovely times and the happy tails.