Does guinea pig prevent loneliness

It is possible, but not very common. If a mate has died then the pig is likely to get depressed for a little while. You can tell this if they eat less, refuse to come out of their house and if they squeak less. But after a while they will turn back to normal. After my guinea pigs friend died, he took about a week and a half and then he was back to normal. If you think that the guinea pig is still very lonely, then you can always buy another pig to live in the same cage. Be careful if you are going to do this, as your old guinea pig may not accept the new one and will fight. To ensure that they get on well, introduce them slowly. Perhaps allow them to spend a few minutes together at first and then gradually increase this each day.