I currently have 2 female guinea pigs, which were purchased from a local pet store by my girlfriend as a gift. After doing further research, we learned that pet stores aren't the greatest option for getting ANY pet, but our girls seem to be happy and healthy so we got lucky. I recently came across two guinea pigs at a rescue, both females, and was wondering if it would be a good idea to add to the family? My current guinea pigs don't really seem to have a bond, but they don't fight. Should I take in the other two, and would this make them happier?