Since I could not find a specific value for tagging a place where only guide dogs for blind people are allowed, I went for it and tentatively tagged dog=guide. Thought of 'guide_only' but wasn't sure of possible combinations. https://www.openstreetmap.org/way/217475661 https://www.openstreetmap.org/way/135069811
Also, I did not found anything else in access tags, too.
Hints or advice? Opinions? Thanks.