At last weekends show, I took my 2009 filly and had her heighted in. She was so small that the height stick would'nt go small enough and we had to use a ruler also. She measured at 24.00" on the dot at 4 months old. Her sire is 31.75" and dam is 32.00". I never measure her canon bone and sire is known for throwing small foals. So Im guessing she should mature around 30.00"- 32.00". What do you think? Thanks for your input.