The (A) measurement in the table is the horse back measurement, not actual rug measurements. To obtain the rug size (EU), measure the horse’s back from the withers to the base of the tail (A). 

 

SizeA Back LengthB Body Length
7529.5"49"
8533.5"52"
9537.4"56"
10541.3"60"
11545.3"63"
12549.2"66"
13051.2"69"
13553.2"72"
14055.2"75"
14557.1"78"
15561"81"
16565"84"