Boston terrier puppy developed cherry eye. Help?

[anastasiasoi]

On Monday, I took my three Boston terriers (8 months old each) to see a vet to have a check up and their rabies shot done. We had no main concerns except that the boy had a bit of eye irritation. It was just red. Nothing else was abnormal. I'd read online about cherry eye and assumed that could be what he had, judging by the name. I asked the vet and he laughed, and said his eyes were just red. He then showed me what cherry eye would look like on each eye if he did have it and forcefully pushed out the third eyelid in each eye. The same day, about 2 hours later, I noticed it stayed like that and it has been since. I went back immediately the next day and he said it couldn't be caused by what he'd done. Said its a genetic problem that just happened to appear coincidentially that day. He gave me drops for inflammation and said there was no way he could have caused it. The puppy had never had anything like it and it's just getting worse. I have my doubts. Please help!