I think Hero's allergic to vaccinations. He got vaccines when he was maybe 12/13 weeks old while we owned him and he got very sick, vomiting, diarrhea and lethargy, the whole thing. He was sick for almost a week, and had to stay with the vet for a over a day. He got an IV and when what we were told was that he caught a virus. Well, he got vaccines yesterday, and lo and behold, he began vomiting today. So far he has no other symptoms, but I'm concerned he's going to get worse. If he does we'll definitely call the vet. But I'm not sure what to do otherwise? He isn't due for any vaccines for a year, should we just bring it up with the vet at that point? Or call? Is he allergic to vaccinations (is that even a thing?) or is it a coincidence?