To Lisa:
NO disagreement here, but my personal experience....and this is ONLY for dogwalk, not A-frame.
Bracken was taught a very solid 2o/2o. Has truly "bailed" only once - have no idea why (that was an interesting Maybell weekend!).
About a year ago, he started offering a "four on" on the dogwalk, and I thought, well, what the heck. He was solidly in the contact zone, and I was fine with that.
I wondered if he would start creeping down and/or stopping higher up, then jumping. Well, he still doesn't jump, but has definitely started creeping.
Sometimes I have to say "touch, touch, touch" (with other physical cues) several times before he even gets solidly into the zone.
Rather than try to retrain him into a running dogwalk ("next dog" - LOL!), I am having him just RUN the board on the ground. I'll gradually start raising it back up, and hope that he just learns to run most of the way. He may still end up with his 2o/2o, or possibly even the 4 on....but at least we won't be wasting a lot of time trying to get to the bottom.
BTW, he is pretty trainable, though perhaps not the brightest bulb in the box....but the thought of actually trying to REtrain is just too much for my weak brain to comprehend!
diane