String him. Ergot to elbow, elbow to withers. Take twine or string or lead rope and hold one end in left hand at ergot (back of fetlock, you can feel point of bone) and take other end to point of elbow with right hand. Hold that end there and take the ergo end and pivot it up by withers. Where the ergot end is, is how much more growth you will get.I know they dont stop growing until they are at least 8/ 9yo hes 7yo now I'm just curious to find out if he may get a little bigger hes 13hh now to me he doesnt seem bum high at all so I'm thinking hes stopped and will just fill out a bit more...im going to start riding him after recently loosing my other horse I'm not fussed if he wont grow any more I love him regardless I'm just curious