I have started three young ones on their first 
    trail rides graduating to training rides and endurance rides. Being able to 
    "pony" them on trail rides with experienced horses has proven to 
    be extremely comforting and reassuring to them. I am fortunate to have 
    trails where I feel reasonably safe letting them just trot along behind with 
    only their halters on. They are introduced to new things ie water, rocks, 
    tree stumps, logs to jump, etc and do not seem to be spooked at all. If 
    their buddy and pasture mate (the one I am riding) is not bothered, neither 
    are they. I just took my two year old on her first trail experience and she 
    seemed to enjoy all 12 miles of the Pacific Crest Trail that we rode. When 
    it comes time for her to be ridden on trail it will seem "old hat" 
    to her. I did have one eight year old mare who did not seem to be attached 
    to the "herd" as half way into the ride, she decided to "go 
    home" and turned and disappeared down the trail. "Not to 
    worry" I told my riding partner. "She won't leave the herd". 
    WRONG! We found her
     waiting at the trailer. Needless to say, 
    I did not pony her again. But I think that she is not the norm. I have gone 
    on group rides where someone has brought along a "baby" and things 
    have gone quite smoothly.
    Any thoughts on 
this????