[daftscotslass]

I got my guinea pig a friend and he/she doesn't like me any more.

FALSE

Guinea pigs NEED companionship. If you have one cavy and get a second, of course their behaviour will change. It doesn't mean they don't like their human any more. They will act differently because, previously, they will have been on their own for around 20 or more hours per day. It would be a bit of a shock to a human who had been in solitary confinement, too.

Cavies are social animals and, like humans, crave same-species companionship. With a pair or group of guinea pigs you will get to experience them playing, communicating and interacting, which is far more rewarding than having them sit on their own in their cage all day long.

You can't house two male guinea pigs together.

FALSE

Males can be introduced to males very successfully. Often two adult males can be paired without problem, but there are less dominance issues when a younger or more submissive male is introduced to an existing male. Fighting generally only occurs when two overly dominant adult males are paired, or where two neutered males are paired with female(s).