Over Dr. Richardson's objection, Moses relied on Jill McEwan, a professional horse trainer, as an expert witness. She had handled horses on treadmills for about seven years, but not in a veterinary clinic or in the context of a veterinary procedure. She testified it was improper for Sauter to discontinue tapping up Rossa because "[y]ou always want to keep the horse going forward until the treadmill has stopped," or it may get injured. McEwan said the "standard is to keep the horse safe as he possibl[y] can and the horse handling and the techniques [are not] going to change whether the treadmill [is] at Santa Anita Race Track or if it's on a ranch or if it's in a veterinary clinic." McEwan also testified there was no indication that Rossa was too tired to respond to continued tapping up as the treadmill slowed. McEwan criticized Dr. Richardson's policy of not using a safety harness during treadmill procedures.