Here seems to be the FEI response to the blue tongue and open mouth issues.
From the FEI website:
“To be considered in connection with the FEI Dressage Rules and
the FEI Dressage Handbook Guidelines for Judging”
Effective from 1 January 2024:
“The most important task for the Judge is to keep the Welfare of the Horse in mind. Therefore,
he/she must pay special attention to all signs of discomfort and penalize them significantly -
be it by deductions from the originally intended mark for minor mistakes or in case of serious
mistakes by a ‘Firewall’, i.e. by a mark that shall not exceed five (5).”
The Scale of Training is of great importance for the presentation of a Dressage Horse. General
training deficiencies must never be overlooked. Severe, basic faults in rhythm, suppleness,
contact, or lack of impulsion, straightness and collection must be clearly marked down. All low
marks must be explained to the Athlete by appropriate remarks, however, it is always helpful
for the communication between Judge and Athlete if the Judge comments also on higher marks.
Apart from irregularities in rhythm or severe suppleness issues, such as a tight or hollow back, a severely agitated tail or arrhythmic, compressed breathing in certain movements, Judges must pay special attention to all contact problems. A neck that is pulled together, an unsteady contact or a very busy, clearly open mouth with the tongue drawn up must be seen as fundamental mistakes. If the tongue is clearly hanging out to the side the mark cannot be
higher than 5, whenever it occurs or is noticed by the Judge - maybe even lower when the tongue is in addition over the bit."
It’ll be interesting to see the first time this rule is enforced in the Grand Prix (if it is), and which judges will enforce it during the Olympics. I hope they have the intestinal fortitude to call out Kittel and Werth and any others whose horses we’ve seen go with open mouths if they do it again.
I hope the judges don’t have to penalize anyone, and horses will be ridden in a way that the open mouths and blue tongues aren’t happening. We’ll see.
ETA Sorry for the weird format, I can’t change it.