The dog door is inset into a sliding glass door, it is a PART of the sliding glass door (a chunk of glass out of the bottom middle of the door) with a seal and flap, etc.
So long as the rule change was properly noticed giving you an opportunity to be heard and other administrative formalities were followed it will be difficult overcome. However, we can not know if the rule change was handled properly without investigating your claim.
Good Luck,
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