Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Allergic Reaction

We are very certain that our dog had an allergic reaction to this heatable disk. At the time we got it and used it he got very ill. He had to got to the vet, was on an IV overnight, etc. It was scary. A few days later after he was almost back to normal, the disk had come in contact with his body and he broke out in hives nearly 10 minutes later. Too much of a coincidence if you ask me.