Is she outside a lot, or are you saying she is shivering inside when it's a bit chilly? I agree, shivering is a sign of pain, José was shivering when he was suffering from cancer at the end. But then again, that big baby would insist on being covered up while on the couch but especially at night. We actually tucked in a blanket between the top of the couch and the wall, so José would just go underneath it and be covered up without needing assistance.