Winona Hartvikson and Lauren Barwick narrowly missed qualifying for the Individual Freestyle; three will go on to the Team Test.
Friday will see Grades I and III Individual Test medals decided and mark the start of competition for Canada's four para-equestrians.
The fiercest Para-Dressage competition yet is set to begin in Japan, featuring 77 athletes representing 26 countries.
The 2018 WEG team of Lauren Barwick, Winona Hartvikson, Jody Schloss and Roberta Sheffield has reunited in Japan.
With a mix of inexperienced and veteran athletes set to take centre stage, the Para Equestrian field is wide open.
There is just one year to go until the ECCO Herning 2022 World Championships of Dressage, Jumping, Para-Dressage and Vaulting in Denmark.
At the NAF Five Star Hartpury Festival of Dressage CPEDI 3*, Sheffield and "Wonky Horse" scored three top-three finishes.
Roxanne Trunnell earns a world record-breaking score of 83.334% in the Grade 1 Individual test as Olympic team hopefuls look ahead to Tryon.
The German rider guided Dominator 2000 Z to win the 410,000 euro finale in Doha, edging Olivier Robert (FRA) and Niels Bruynseels (BEL).
Steffen Peters (USA) and Suppenkasper earn their 16th win in a row to open AGDF 3 as CPEDI 3* competition also gets underway.