The young Arab I’m bringing along is 4 and will be 5 in May. I didn’t ride her until last fall for the very reason Icecapade is talking about. She came to me as a “training problem” as a late three-year old. I figured she needed more time to grow up. Turns out that I was right, given that I haven’t found her hard to work with. We do a couple miles of trail at a time–enough for training but not enough to make her act out from stress.
I assumed the OP is doing the same thing, despite the horse bing a year younger. I’m used to OTTB’s who at 3 yo may already be working on their second career. It throws me off to think of a 3-year old as a baby, regardless of breed. Doesn’t make it any less true that some horses need more time to grow up before accepting an adult horse’s work load.
It is possible the OP’s mare is simply too young for what is being asked of her, in which case she is likely to exhibit “problem” behaviors. It definitely needs to be considered as a cause.
Icecapade, I’ll get back to you on some possible dates to meet at Fair Hill. The snow has really messed with my trimming schedule, and I’ll be working the next few weekends to make up for it. Love the snow, hate that it puts a monkey wrench into my work schedule, which messes up my riding schedule! I finally got boots for Frank. He’s not fit, but he won’t be ouchy out on the trail.