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Hi there. Thanks for the question. Let me see if I can help. 99.8 is NOT a fever for a dog , it's a normal temperature. That said, his symptoms are very concerning. My first thought is potentially diabetes. Schnauzers are very prone to this condition even if not overweight and around 10 years old would be a common age to develop it. It would cause lethargy and weakness and inappetance and excessive thirst. Of course, many other things could cause similar signs, they are very nonspecific symptoms...but given the age and the breed, this is my immediate gut reaction. I would highly recommend getting him in to see a vet today for an exam and some bloodwork. Treatment is of course diet management and insulin shots. I hope this helps. Best of luck.