Measuring a foals pastern & canon bone in his first few days of life can give you a good insight on how tall he will end up. We use this formula with our foals and we expect it to be accurate, plus or minus half an inch!
STEP 1.
Measure pastern & canon bone from top of hoof (coronet) to center of knee.
STEP 2.
Multiply that measurement by 4.
STEP 3.
Add 2 inches.