Last winter my 18 year old welsh cob pony spent a considerable amount of time in a barn with 17 other horses due to the snow and personal injury. I noticed her breathing seemed different in the school, she coughed occasionally, became short of breath and gave off the impression that she was uncomfortable when being ridden. (Before this she was ridden 3/4 times a week so it wasn't due to unfitness). We called the vet out who concluded that she had a fast respiration rate and a very high white blood cell count. The dusty environment may have irritated her so I changed her bedding from straw to Bedmax, soaked the hay and fed from the floor. She was also put on antibiotics and Ventipullman. We moved to an outside stable and within 6 weeks she there was a dramatic improvement resulting in her being ridden without any sign of breathing difficulties. She then suffered a relapse and is no longer able to be ridden and within 7 months she has had 4 lots of antibiotics, endoscoped and scanned twice plus a sample taken from her trachea. Yet the infection has not been identified.She is currently on steroids for a month and then aloe vera. She looks healthy, very upbeat and has a good appetite. Has anyone else had similar problems and is there anything else I can do to make her more comfortable as we enter the next winter?