Hi JAHW
It’s not always easy to know exactly what people mean, i.e. when you say the hog sounds like a steam train. It depends what it’s doing when it sounds like a steam train. For instance, if it is just walking along on it’s own, or feeding on it’s own making a noise like a steam train, it could have a lung problem. But if it’s with another hog which is circling around it and it’s huffing rythmically, then it’s a female and that’s part of the ‘courtship’ and can go on for hours.
Unless you can immediately recognise, ie. that it’s courtship, I would ring your nearest carer in case the hog has a lung problem. Especially as you say you are normally seeing one hog at a time. You could then explain the sound in more detail. You can find details of your nearest carers from the BHPS on 01584 890801.
