It depends. They certainly wont be aggresive, but if you do, make sure to spay and nueter them.
Well,the girl guinea pig will choose a boy because they will be all over here and then get pregnent.Maybe she can get pregnant by diffrent male guinea pigs but i think it is unlikely.
yes u can put three brothers together, but if you show one of them a girl, or put a boy with a girl and then put them back in the same cage as their brothers they will smell the girl on the brothers fur and will fight, but if u do not show or put seperately one boy with a girl then put him back in the cage, they will be best friends, i had three like that, till one boy went with one of my females then went back with his brothers, we had to put that one that went with the girl in a separate cage.
Yes. a boy hamster can be with a girl but i bet you they will have babies.
don't keep them in the same cage if they have not been spayed or neutered unless you want babies.
yes, mine are both in the same cage
yea. But if they start mating you have a problem!
it depends if they are both boy or girl. two or more boys will fight but girls wont.
NO
Girl
I myself own two girl guinea pigs. But i dont understand why they get along so well. I belive that it my just be that girls have no competition, because the competition is left to the boy guinea pigs. So, therefore, that is why girl guinea pigs get along better than boy guinea pigs.
If its a boy its three weeks but girls can in the same cage.
You can tell if a guinea pig is a boy or girl at the age of 4weeks