Any info or advice would be appreicated. Today, I took my daughter and her Guinea pig to the vet, because, as she said, something was wrong with him. He hadn't been eating or drinking much for the past couple of days, was lethargic, and his eyes were mattering. So, we took him in, vet said, he thought an upper respiratory infection, and was going to prescribe an oral antibiotic. My (adult) daughter, is mildly mentally disabled, and altho fairly high functioning, but I didn't think she was going to have much success at attempting to give oral medication, so I asked about the possibility of giving an injection instead. He said, sure, that the one they would give isn't something they can give to a Guinea pig orally, because they can't tolerate it, but that they would do ok with injection. So, he gave him the injection and we left. As we drove back to her apartment, he was acting agitated, and kept arching his head up. She thought he was just getting agitated from being out of his cage for so long. I just thought it was strange. I went in to her apartment with her, to help her administer the eye drops that he also gave her to use, and make sure that she could do it herself. As soon as she sat down with him on her lap, she said, 'now he's not moving at all. Immediately, I felt a feeling of doom. I turned around and said, 'what'? She said, 'he's just lying there now'. I looked at him and tried to nudge him. He didn't move. I tried again. Still nothing. I tried a little harder, and he was basically lifeless. His little feet has already began to curl up. I felt his chest - and didn't feel any breathing or heart beat. 20-30 minutes after getting that shot, he was dead. I called the vet and took him back. He was, of course, gone. My daughter was crying. I said, 'could that injection have done anything'? He, of course, said 'I think just the stress of being in the car probably stressed him out more then his little system could handle, unfortunately.' So - my question is, after reading info on line about this drug, I am very suspicious that that is what killed him. The drug that was injected into him was called, 'Convenia'. And from what I am reading, is contraindicated in dogs and cats, but I can't seem to find any info on smaller animals such as Guinea pigs. Please comment with any factual info that you may have.