Hi, my pekingese Snoot was given this for pain after getting neutered. He got really mean, was panting terrible, high fever,became unaware of who any of us were and a few other things. I took him off the pill and he was fine in a day. Most dogs are fine taking this for pain but there's always a chance for a reaction with any medicine. Your baby will probably be ok taking it but watch him carefully to make sure he's ok. I hope your baby gets back to himself soon.