Ok so I remeasured my horse, since I messed up yesterday.
Whe I got her she was underweight with a potbelly.
February, 10 months, 27", 90 lbs.
Now she really has a belly, 17 months, and according to this measuring chart
http://www.lilbeginnings.com/info/misc/
Girth: 41"
Length: 40"...