I'm so sorry your senior dog has to go through a splenectomy. Sending all my positive thoughts for a successful surgery and smooth recovery. Post-surgery, it’s essential to keep your dog calm and comfortable, monitor the incision for signs of infection, and offer small, easy-to-digest meals. Limiting activity and ensuring proper hydration will support the healing process. Don’t hesitate to reach out to your vet with any concerns during recovery. Stay strong for your pup—they’re lucky to have you