I have had my guinea pig for nearly a year. One day he looked ill so we took him to the vet. He had a Stinky white substance in his mouth and was really sluggish. We got prescribed some medicine and took him back home. He was VERY cold and we warmed him up as best as we could. He slowly got less and less active. Eventually we put him back in his cage to see how his brothers would react when I heard a weird noise. I checked him and he had been SICK (guinea pigs do not have the ability to be sick right?) I held him in my arms and he convulged and died in my arms, releasing that same smell upon death... What happened to him? the vet was baffled and had no idea either.