After sometime we added a third guinea pig (who we no longer have) and expanded the cage up ward. It was about this time as well that my 2-year-old became tall enough to reach inside the C&C and pester the guinea pigs. So this new fully enclosed model came to be:
The cage was changed many times after this trying to get the 3rd guinea pig to get along with the resident two but after it became apparent he just would not we rehomed him and settled on this new 2x5 cage arrangement:
For Christmas my son got another guinea pig Buddy and the cage stayed the same. Buddy has a very easy going personality and didn't need any help getting along with Ben and Eddy.
In February I brought home Bacon. For the first 3 weeks all four got along great in the 2x5 C&C but after awhile they started to fight and I expanded the cage again to what we have now! A mammoth 2x7 with two hay loft areas. Lots of tunnels and hideys in this cage! The guinea pigs love it and we have not had a serous guinea pig fight since.
I normally have fleece in the cage but we went out of town this past weekend and used wood chips so it was easier on the pet sitter.