In 2017 I got three guinea pigs from the same litter. All three of the sisters have never had any health complications however we did get the runt of the litter. She was always a little bit smaller than her sisters but this was never a concern as she was only a little bit smaller. Yesterday I made sure they had water at about 2 pm and they were all fine and acting normally, the smallest one was eating hay when I saw her, at 4 pm I went to feed them some pepper and she was laying there in a weird way so I tried to prod her and she didn't move. She was so stiff when i moved her. I've completely cleaned out their enclosure and my other two pigs are acting completely normal. Do they just not realize she's gone or are they just okay with it? Is there anything I should do to help my other two? I'm a panicked by it all because I know pigs can die if they lose a pig close to them. Any advice would be really appreciated. Thanks 
