This thread reminded me of my 'Phantom Widdler', way back in the early 1990s.
I looked out a little rhyme ( doggerel! ) I wrote for a cavalier club magazine.
DOG OWNER'S LAMENT
I have a Phantom Widdler,
He strikes without a sound,
He only performs the dirty deed
when no one is around.
I cannot blame the bitches,
It was not them that peed
Hall curtains bear mute witness
That a dog performed the deed.
One day I'm going to catch him,
Retribution will be swift,
And the culprit will be lucky
To still have a leg to lift!
I had my suspicions, I never did catch him, but it stopped when my tricolour dog called Marcus died.