Well... I dont think you should let them live in the same cage... just for safety reasons... but you already said you werent going to. I think that letting them play together INDOORS ould be OK if YOU are watching them. But OUTDOORS... may not be such a good idea. ESPECIALLY if you arent watching them. Like it said on that website, rabbits may burrow and your piggy will escape and be gone forever! But if you got another guinea pig.... (male would be best) then they would be fine living together. I once owned 2 male guinea pigs... and they could not be taken away from each other. One time we tried to see if theyt would like living apart... but they cried until we put them back together!!!

Well... hope that helps...

-Carly