My 15 1/2 year old cat has suffered from chronic constipation/obstipation resulting from a spinal cord injury he suffered a few years back. So far, we have managed well with lactulose and the occasional deostipation. I have to take him in tomorrow for a check up as he has been unable to pass stool for several days. He was in a few weeks ago and they said that he was dehydrated and gave him some fluids (subq, I think) and then he was able to pass stool on his own. The lactulose just doesn't seem to be helping anymore. Could it be because of dehydration? Is this still treatable medically? PS: We have tried propulsid, but it didn't help, neither did high fiber diets). Many Thanks. Vessie (cat) and akaJW