Guinea pigs are social animals, and so they would prefer to have company. However, you need to keep several things in mind.
Sex: Unless you want them to breed, which is recommended only if you are an experienced owner, only get an animal the same sex as your current animal. So if you have a male, get a male. If you have a female, get a female. This avoids complications that sometimes happen in spaying and neutering them later on.
While it is possible that same sex pairs will fight, this is no more than a breeding pair. Guinea pig's have their own personalities, and some will clash, no matter what the sex.
Try and match up a dominant with a introverted guinea pig. An older pig with a younger one is also a good option, however, as the younger one gets older it may try and claim dominant status over the other, but this won't last long. Try and avoid this by not getting a very excitable younger animal for a very calm older one, as the younger one will definitely start fights as it grows.
When you pair up a young guinea pig with any other guinea pig, there is a chance that as it grows, and goes through adolescence, they will fight for the top position in the hierarchy, but if this happens you can simply separate them for a while.
Sex: Unless you want them to breed, which is recommended only if you are an experienced owner, only get an animal the same sex as your current animal. So if you have a male, get a male. If you have a female, get a female. This avoids complications that sometimes happen in spaying and neutering them later on.
While it is possible that same sex pairs will fight, this is no more than a breeding pair. Guinea pig's have their own personalities, and some will clash, no matter what the sex.
Try and match up a dominant with a introverted guinea pig. An older pig with a younger one is also a good option, however, as the younger one gets older it may try and claim dominant status over the other, but this won't last long. Try and avoid this by not getting a very excitable younger animal for a very calm older one, as the younger one will definitely start fights as it grows.
When you pair up a young guinea pig with any other guinea pig, there is a chance that as it grows, and goes through adolescence, they will fight for the top position in the hierarchy, but if this happens you can simply separate them for a while.