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Hi this is Dr. Hill. When a dog is lip smacking (which is what you are describing) that is a sign of nausea. I worry about pancreatitis in a Schnauzer. Has he had any high fat treats, meats, cheeses or marrow bones in the last week or two?
That is really unusual behavior. I would definitely stop the cheese because it is a common cause of pancreatitis. Schnauzers are so predisposed to pancreatitis that they really should not have any high fat anything. I wonder if the behavior is related to his abdomen hurting him. Is he wanting to stay outside to eat grass? this is common for a dog to do when they are nauseous. I would give him a bland diet for the next 3-5 days and pepcid ac 1 mg per 2 pounds body weight by mouth once daily. If the bizarre behavior and signs of nausea persist beyond 48 hours then he needs to be rechecked by your local veterinarian. Pancreatitis can be a mild loss of appetite to severe with vomiting blood and bloody diarrhea. Feel free to ask additional questions. If you are satisfied with my answer, then please take time to rate. Take care.