Originally Posted by Lobelia Overhill
I wouldn't start backing a horse until it was a 3 year old, and wouldn't do anything 'serious' with it until it was 4 years old.
Same here. If I had a heavier horse (who mature longer) I'd give it even a bit more.
Kimber, you're not saying what breed your horse it. Sometimes it is a very important information to decide when to start working with a horse.