The talk of blindness made me think of the use of a finger inside a cup to know when liquid had reached a certain level.


Ritz does this right after I fill her water dish - she gently paws the surface of the water to disturb it, I assume so she can tell how far down to put her face....and always laps from the corner of the dish, never the center.

Also has to lick the paw clean before moving on...