I just got my little piggy on sat, she was doing great the first day, now it almost looks like shes having problems standing up. I go to her pen and get her out of her house, and as soon as she get out she dips a bit then stands again and walks off. But every so often she dips again. She is eating and drinking but i think that its only when i kick her out of her house. her litter mate is doing the same thing at a different house, bought the same day. PLEASE HELP!!!!! I dont know what to do.