This is far too much analysis for a Monday morning. lol
Many dogs, and not a few cats are toilet water connoisseurs. I believe there is a cooling effect.
Water is well known for that property.
Dogs are well-known for their propensity to eat their own (and others') feces and vomit. Cats will happily clean their anuses with their tongues. Perhaps this all adds to their willingness to consume toilet water, or perhaps even creates in them a kind of desire for it, given the scatological and urological properties it most likely contains.
There's no goin' back now!
"May Thy Cross, O Lord, in which I seek refuge, be for me a bridge across the great river of fire. May I pass along it to the habitation of life." ~St. Ephraim the Syrian
"Sometimes you're the windshield. Sometimes you're the bug." ~ Mark Knopfler (?)