I have a 3 year old female gerbil and in the last day her abdomen has become at least double the size. She is moving around and eating healthely. I checked with two petstores and they have heard nothing that compatres to this. Through the years that I have raised gerbils I have come across many diseases and health problems but I have never seen something quite like it. Could some one please help me I have no idea what I should do. She does not look like she is in pain but she is bloated up fairly bad. She is not in with any males and her diet is consistant. Thanx for any help/ pointers.