This winter was really bad, and I didn't have an indoor place to ride so he was off for eight months until the weather got better. I started in later spring and he was doing great, no serious issues.
But recently he has begun to do something I find very odd. When cantering on the left lead he will canter for a while and then do a regular canter stride with his front legs, and switch to a trot with his hind legs. Since he can only do one stride like this, afterwards, he breaks into a fast and stiff trot. Which is unsual, because he is a very supple horse and I always do bending excercises before & after I ride. I've had my mom watch to make sure that's what he was doing, and not doing a funky crowhop or something.
He has been checked by a vet & chiro and declared sound.
I need some advice, I'm taking him to the county fair in about 11 days :/