My first guinea pig Nibbles sadly passed away in November 2005, I miss him so much my little baby boy :'( That's him on my avatar by the way. He had to be put to sleep when he was around three and a half years old but I'm still unsure why. He seemed perfectly happy and healthy but one morning when I went to feed him I noticed he wasn't moving and I realised he couldn't get up at all, he couldn't move his back legs at all so I rushed him to the vet where sadly he had to be put to sleep :'( I still have no clue what was wrong with him though, he was perfectly healthy the day before and then the next day he couldn't even move. I wondered if anyone has any idea of what was possibly wrong with him. The vet said he might have had a fit in the night, but why? Anyone know?