''He feels a million bucks, and that's the most important thing."
Dixon will use the team test as a warmup for her individual championship on Thursday night (NZT). The top seven from that event progress to the musical freestyle the following day.
Para-dressage chef d'equipe Warrick Allan is confident Dixon and Doncartier wil make the cut.
''Anthea took what she learnt at the London Paralympics and has progressed to a whole new level," he said. "I believe she is more than capable of a personal best here."
The world games are also the first Rio 2016 Paralympic Games qualifier for the discipline.
New Zealand are also represented by teams in the endurance on Thursday night (NZT), the eventing, which starts on Thursday and runs until early Monday (NZT), vaulting, beginning on September 2 and showjumping, which begins the same day.
A record 76 countries are expected to take part, and over 500,000 people are expected to attend the two-week event.