yes with females the more the better as they are very social. with males its best to keep just 2 together in plenty of space to prevent fighting. its best to intoduce them when very young but most males will accept a very young (4 to 6 week old) friend. guinea pigs get very lonely if kept on their own so it is always recomended to get at least 2. most shops do deals when you get one or more although its better to rescue or get from a private breeder, as they are usualy better cared for and you can see their parents etc.
a guinea pig.
yes, guinea pigs are social animals and live in small herds in the wild. A guinea pig must have company in order for it to be entirely happy- without another guinea pig to talk to and exchange pleasantries with, the guinea pig will become withdrawn and depressed.
yeah
Only the guinea pig she mated with but be sure to separate them after birth
it depends what type of guinea pig you have
Most likely, yes.
They do like company and would definitely prefer another guinea pig with them.
to live
yes, but don't be surprised if the Guinea pig rejects it too. but it might not
Yes, i bought one Guinea pig and added another around the same time, and they get along great.
Rabbits/Bunnies do NOT make good cage mates for Guinea Pigs. The Guinea Pig needs another of its own kind to thrive. Even if it does have another Guinea Pig partner, the Rabbit/Bunny may try to kill, hurt, or eat them. I hope this answers your question!
If you only have one guinea pig get him/her another guinea pig friend of the same gender. It could be lonely.