Funny thing, when my Scampi was prescribed Glucosamine/Chondroitin, after having it for less than a week he started to be sick, so I stopped it for a couple of days and he was fine until taking it again. I went back to my vet who although didn't know if this was a side effect or not contacted the rep and it turned out that nausea and vomiting can happen with some dogs taking it.