Backchaining

I have to say training Moto has been the biggest challenge of my brief dog-training experience. I trained my Novice A dog Dusty and it was always fun. I trained Shiloh to an OTCH and while it was very difficult, the time with him always flew by. Blitz was amazing and incredible. Moto....well...it's different. I thought we'd had that big breakthrough but Tuesday's lesson at my trainer's was not very inspiring. OK, maybe I'm being a bit tough on Moto. He did his pivots and while he was not enthusiastic (even with his beloved Cheez Whiz) he did it and he did try every single time. In fact, he did everything asked of him. There's just no SPARK. This time it was the heeling he didn't want to do. Well yes he did it, but he didn't feel like giving me attention. I need to re-evaluate this. I love attention heeling so very much but it has been SO HARD with him. If I really, really want attention heeling we are going to have to do some major backchaining. He can give me nice attention at home. He can also give me nice attention in different places, if he has the desire to do it. But if he's not in the mood, do I really want to start correcting this? Heeling to me states what your relationship is. It's everything. This dog can heel, and I believe he can do it very well, but it may not be in his being to do it with attention. I will be chewing on this for awhile as we continue our training.
Meantime he continues to roar ahead in tracking. Now THAT training is thrilling. He now works with his tail wagging he is having so much fun. He's fast and accurate.
Blitz is worrying me. He appears OK but is increasingly clingy. And the other dogs are excluding him from their playtime. When the dogs play Blitz now comes and cuddles with me or Erik. I am trying to make him feel special by giving him special snuggle time with me in the evenings now. He comes on the bed with Dusty and I when I watch TV or read before going to sleep. The vet said he would live to be 2, and if we were lucky he would make it to 6. Blitz will be 2 in February. Again, nothing physically appears wrong but I am concerned.
Maybe it's just the gray dreary day. I hope the sun comes out to cheer my mood!