We have not bought anything yet, and I am just in the researching mode right now. Whereas I continually find that having at least two pigs is recommended because of the pig's need for companionship, I have not found a recommended size for a cage for two pigs. Just find statements such as: "proportionally bigger than the cage for one pig". Can someone clarify this for me, please? I read someone's posting about buidling a cage six feet by four feet; something of this size would pretty much eliminate our being able to own guinea pigs. But, I do want to make sure we can supply them with what they need; if not, then we would not pursue this any further. Thank you.