Hi I have two sister sows 6 months old living inside. One seems to grumble every time her sister tries to go into the sleeping area and makes her sleep outside of it on her own wich is sadd to see . Is this normal? I have put in another shelter so they have one each only problem is ginger flits between the two and does the same for each shelter leaving blondie with the one she doesn't want at that pericarditis time.. what do I do? x