Yes. The USEF requires horse injuries/fatalities, as well as rider injuries/fatalities to be reported to the USEF, in ALL disciplines.
BUT the horse injury form for Eventing is different from the horse injury form for other disciplines,
AND horse and rider injury forms for Eventing have been required for many more years than they have been required for the rest of the disciplines.
I don’t know why they (USEF) are concealing the data.