I got Lizzie on the 27th of December and Nibbler on the 15th of January (both are female). Lizzie will kick Nibbler out of a hideout even if Lizzie is in a different hideout, she would also steal food right out of Nibblers mouth. Yesterday, she basically attacked Nibbler and then she started squealing and rubbing her bum against the ground and then she did this weird twitchy thing. After that, she hid in a dark corner and didn't move. Actually, right now, there's quite a bit of tension between them while they are on floor time. The weird thing is though, Nibbler always follows Lizzie into the same hideout. I don't know what is going on here, if this is classic dominate behaviour or if I should be worried. I am a new pig owner, so please help!