@PoptartShop, it's good to know that a little lethargy after vaccines can be normal. I think you're right that he didn't sweat much because we didn't work hard. But of course, I will be keeping an eye on him and I know the BO is too.
While bringing Nav in today he was totally goofy, trying to bite the lead rope! He's done this once before, but it's strange. I don't know if he's just feeling mouthy or playing or what, but I caught a picture of him doing it this time:
I rode this morning, Nav did ok... He was a bit of a freight train, really bearing down on the reins at the trot and canter. So, since I didn't want to fight it today, we just didn't do much at the trot and canter. We spent a lot of time working our leg yield along the long side and Nav did really well! I could feel him really reaching across with his hind legs, we had a good angle and he wasn't overbent. Even on his stickier side he had a decent reach and bend. I was so happy with him! We did it a little bit at the trot, on his easier side. Still needs work but we had some good steps here and there. :)
After the ride I tried doing some carrot stretches with him, and this is when I realized he's SUPER stiff. Like, he used to be able to reach back toward his hip during carrot stretches, but today he could barely reach to his shoulder :( So that kind of makes sense that he wasn't riding very well and just wanted to run, he probably didn't feel very good! I don't know what the cause is, could be anything - rolling weird and pinching something, playing with his pasture mates - you know how horses are. So I'm finding out if there is a normal chiropractor who comes out to the barn and if there isn't I'll look into finding one. I'm going out of town for a few days this week so he'll have a good 4-5 days off, so maybe it will resolve on it's own, but if not I definitely need to have someone work on him.
Anyway, I also found out today that Navigator likes oranges! So here's a little clip of him trying one for the first time :)