I have a 7 month old bull calf whose rumen distends up and down instead of side to side. He's been like this since he was a baby calf and started eating grass. It's a bad picture I realize but basically his belly always sags down and his top line is always bulged up - never straight. Rarely bulges side to side. None of his contemporaries are like this and, as I said, he's been like this since about 45-60 days old. Doesn't seem to matter what he's fed. Otherwise has always seemed healthy. Thoughts?