I walk my 2 dogs a lot, and it's wonderful meditation. One place we head to in the afternoons has a negative edge pool. It sits on the upper level of a plaza downtown where we live.
this is my younger fella, who's always in the lead. His head made it into this shot as we approach. The older dog, and myself, being lots older and much more mature, don't rush ahead.
in the summer, the doggies need water and they can hop onto the bench and drink the water rushing smoothly over the curved edge or the moat itself - as demonstrated in the third photo.
to be continued...