Considering this, what to do when one guinea pig died?
Leave your deceased guinea pig in the cage (or put them back if they died outside of the cage) so that your remaining guinea pigs can see him. They may ignore him or trundle up and lick him. Give them half an hour with their friend before you remove him from the cage.
Secondly, do guinea pigs know when their friend dies? Guinea pigs know when one of them dies. You have to see how well your sister is dealing with her bereavement. Unless your remaining girl is acutely pining and needs company as a life saver, it would be good if you waited for at least two weeks anyway.
Then, what happens when a guinea pigs companion dies?
Your guinea pig may grieve after the loss of a companion. When a guinea pig dies, if you scent a cuddly toy with the deceased pet by rubbing it on his fur as well as the bedding within the cage, you can then put this in the cage for the remaining guinea pig to cuddle up to. It can be a comfort to them.
Can guinea pigs die from being lonely?
The surprising truth is – yes, guinea pigs can die of loneliness. They need a companion in their life because they are social animals. If they are living alone in the cage then you need to play with it all the time in order to keep them motivated and happy.