Canadian para-dressage rider Noni Hartvikson and trainer Lindsey Partridge were injured in separate accidents involving spooked horses.
Going into the final weekend of the World Championships, only Roberta Sheffield and Wonky make it into Sunday's Freestyle.
Competition got underway with two of the three Canadian athletes performing their Grade I tests on Wednesday.
The vaulting individual competitions wrapped up as the para-riders and horses tested out the competition arena prior to their first test.
Jody Schloss, Winona Hartvikson and Roberta Sheffield will rock the maple leaf at the FEI World Championships in Herning.
Laura Hall and Winona Hartvikson racked up some good scores at the CPEDI3* Desert Dressage III in Thermal.
A tight medal race at the Paralympic Games saw Great Britain take the gold, The Netherlands silver and United States the bronze.
Winona Hartvikson and Lauren Barwick narrowly missed qualifying for the Individual Freestyle; three will go on to the Team Test.
The 2018 WEG team of Lauren Barwick, Winona Hartvikson, Jody Schloss and Roberta Sheffield has reunited in Japan.
Canadian dressage and para-dressage athletes made their presence felt down south with strong showings during the third week of competition at the AGDF.
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