It's not unusual for pigs to drink too enthusiastically and then have to cough a bit to clear themselves out when it goes down the 'wrong hole' (so to speak). I wouldn't treat that with antibiotics.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry