We are just doing our second clips now, you should be safe. That being said I happen to be the lucky owner of a young TB that decided against growing much of a coat this year and didn't have to body clip. Not only that, but now he has decided that spring is indeed on it's way since the light change and he is already shedding! Yeah for me!
I start clipping in Sept, clip until the 1st week of Dec. If I do a full clip then, I may have to zip off the guard hairs before April shows but that is all. If I do a blanket clip in Dec, I do another clip in March/April for the spring show because the pony is never shed out in time.
I always clip my white horse in late March.. I cannot stand all that long, nasty, stained hair.. I like to start spring with a clean slate ie: a white-again horse nothing cleans a white horse like clipping it naked!
"Kindness is free" ~ Eurofoal
--- The CoTH CYA - please consult w/your veterinarian under any and all circumstances.
It is never too late to clip, and if he's in work, he'd probably be much happier with some kind of clip then being fuzzy and getting sweaty. It would be like us absolutely having to work out in our wool sweaters and puffy coats and not being allowed to take them off!