One of my pigs keeps coughing/hiccuping, I assume it's heaving hiccups because it's like Peter Gurney describes on his website. She only does it when eating, and I think she shovels her veg down because her sister will take it off her! (sister also eats quickly but doesn't hiccup). The thing is, why doesn't she learn, and eat more slowly? Or is this something to worry about? There's nothing else wrong, no weight loss, no URTI.