I'm so sorry for what you and Chewy are going through. You will know when the time has come and God will help you make that decision. My Kady did the same thing for over a year before we lost her. I just couldn't make the decision again and since she didn't seem to be in any pain I just let her do her little circles. I took her to the vet on a Thursday morning because she had also started pressing her head into things. He thought that along with the senility problem she might have a brain tumor but I still could not make the decision to end her life. My poor Kady started seizing late that night and making a heart renching moan that I will never forget and I knew the time had come. She seized on and off all the way to the emergency vet. She pooped and peed all over her blanket. I didn't even ask the vet to check her out just to please put an end to her suffering. I kissed her good bye and held her the whole time because I didn't want her to feel alone If I had known this was going to happen I would have made the decision that morning. Looking back I see that her quality of life was not so good for a long time. We miss her terribly but she is in a much better place and we'll be together again someday. .
