Hadley, my 2-year-old pig, has been having on-and-off hooting noises for the past week or so. She will sound hooty for half an hour or so, then get back to normal, then do it again later on or the next day. At first I blamed a new bag of hay that might have been dustier, but have switched hay bags and it still persists. She otherwise seems fine- active, eating well, no eye or nasal discharge. I have booked her a vet check for tomorrow morning- any advice on what to ask they check for? I understand hooting can be a heart issue, but am hoping it's not that, as she is not old and seems so healthy!