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I would like to help you with Duke. It sounds like he isn't feeling well. Dogs that are listless can have multiple issues....some are painful, others have upset stomachs, and others may have something more serious developing. Since Duke is an older guy, a senior exam, bloodwork and urine testing should be done to help figure out if his problem is serious. Even though Duke is a smaller breed (Westie), they can sometimes have arthritis. Your vet may prescribe pain medication for him to help him perk up. Continue to watch him closely, and feel free to share more info if that helps. All these details can be very helpful clues for us to figure out what the actual problem is, since his symptoms right now are vague and have come and gone before in the past.