Of the responses so far, I think you may have determined the correct direction I need to head, in order to solve this problem, Julie. I will get Mecklenburg's book, and will look up the articles you have suggested. I am familiar with the Cleanrun website. As far as the eyes go, I do not feel this is the problem. This dog marks really well at long distances and gives no indication that it is his eyesight that is the problem. I am convinced it is a timing issue. However, that being said, I will not discount the eyes and will do some follow up there. This has also made me think about his ears. I am constantly fighting with ear infections on this dog. I just wonder if that could affect his jumping in any way. I spoke with my friend, Steve Bernock, yesterday, and he gave me some good ideas (similar to what Julie has recommended) that involve taking the time to teach proper timing of the jump process to the dog. He knows this particular dog, too, and like me, he doesn't believe this is an eyesight issue. As far as a solid jump, Steve S., these are stacked logs and straw bales that go all the way to the ground. Windy, thanks for your input as well.
The jumps I have set up are in my Double T field. There are three log jumps enroute to the back pile all varying heights from about 12 to 20 inches tall. On my short right over there are two straw bales set end to end that the dog must jump, as well as my long left over. So.....basically I have combined my no no procedure in with my Double T. My field is mowed flat as a golf course with about 4 foot lanes to indicate the back line and each of the over lines. The lanes are determined by about 6 inch wide and 6 inch tall grass strips. I teach my dogs to remain within the contours of the lanes at all times, never allowing a direct return or send (or flair) outside of the lanes. I teach all of the lines (both back and over) first (teaching the log jumps of the back line first as well). Then I teach the dogs over from each of the two intersections. Next I put it together in the single T, and finally the double T. By the time I am finishing up, the dogs have lots of practice with back casts, over casts, come-in casts, and disciplined casting. This overall process has been broken down to simple steps for the teaching/learning process. Bottom line, there is quite a bit of repetition of jumping, and the dogs are quite familiar with the heights and positions of the obstacles. This particualar dog that is having problems is the only one I have ever trained that has had this problem in this environment. He is very eager and willing to please and loves the work, so I do not want him to get hurt. That is why I posted on here for some help. I really believe at this point, he simply needs some specific teaching as to how to jump correctly, and I am going to persue that. And yes, I will have his eyes checked again, all though I do not feel at this time, that is the problem.
Thanks to all who have responded,
Clint