If you have bought them when they have been loving together from very ! early stages of there life yes they will be ok living together but if you purchous them seporoutly do NOT !!! put them together they will fight and it wont be nice it can end up with brocken bones no ears blindness and eveen death ! if you want your guiniea pig to have a friends to live with make sure you buy another guinie pig ,, if you already have a feamale you can get another femal or a male but if you have a male guiniea pig dont buy another male as they will alsoo fight !!