Friend's dog is under vet care but been sent home as practice doesn't staff small animals over the weekend. Dog is small terrier x age 10. Had slight cough earlier in the year but it has returned. Vet has administered fluids IV and AB's and fever-reducing meds earlier in the week, and he's on paracetamol under instruction in the meantime. She's been cautioned to rush dog to the emergency vets if he deteriorates. Dog off food but only been froth-sick once and looks very sorry for himself. Known for dramatics but he is not right at all. Vets haven't come up with any diagnosis, well, not one they want to put a name to anyway. Any ideas in here?