Thanks luckypenny. It's been about 4 months and the problem has continued and I am worried it's something more serious. Yes, I did take stool samples with me to the vet but they did not detect anything out of the ordinary.
Thanks so much for the stew tip - I will definitely try it! I absolutely agree with you that at this age they can be indulged. I just want him to have the best life possible in his senior years.