The symptoms you described can be several things. The most common are bowel infection or anal glad infection/impaction. I would call the vet on thier afterhours line to let them know what is happening as anal glands can rupture ( in which case prompt attention would be needed). If they do not suggest coming in tonight, then they may just need to express the glands and give an antibioic in the morning. I hope he's doing better soon -Robyn
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