Ok, here's an update I'm pretty happy about:
I did a nice groundwork session, and at first he was all lazy but he didn't really drag his hooves, he just moved the back ones like he was about to drag them, only that they were the tiniest bit off the ground. I trotted him in hand along the long part of the paddock and he perked right up with with happiness, since I havent exercised him for a few days. No dragging at all, nice, normal happy-horse trot! WHAT A RELIEF! And he slowed to a walk, he walked perfectly.
Ahh......*gives sigh of relief* he was probably just a bit lazy or uncooperative that day. Believe me, he does have his "grumpy not-wanna-work" days
My mind has almost been laid to rest....almost. I'll keep watching him. I have that little "jump" (two car tyres with a long sheet of white old fabric in between) on the paddock and went to clean it up, amd Luca just walked over to me, started trotting amd went right over the jump! he free jumped by himself! Oh....I love this horse.....so much!