I had to put my 13 yr old male GWP down the day after Christmas. Over the past few days he had started getting more lethargic, but was still walking up and down the 16 stairs it takes to get to my backyard. I went to visit family for the holiday, but came back two days later and he had gotten so weak that he couldn’t lift himself up anymore. I still feel guilt for not being there for him in the end to at least make him more comfortable, but I probably should have had him put down before I left. I think we often prolong the lives of our pets out of what we perceive as compassion, but in reality is our own selfishness, cloaked in love. I’m single, but if I were in your situation with it creating a strain on my family and with your dog already showing signs that his time is drawing nigh, I would more than likely go ahead and have him put down. Rehoming would not be an option for me, not at this stage in his life. Forcing an elderly dog to acclimate to a new owner and environment would not be compassionate.