I had two guinea pigs once. One, the male one I got for free from the family up the road, and the other female one I got from a pet shop (a purty abyssinian one)
Turned out the female was already pregnant by the time I got her home. My duo of cavies turned into a family of six
. I ended up building them a 3x3m cage in the backyard.
Abyssinian ones aren't really suited to outside as they have long hair, long trains of it, and it easily gets clumps and dags in it. All four babies had long fur, it was horrid