After they eat your cat. Eating poop is a sign of mineral deficiency not normal canine behavior.
I had a german shepherd who thought the cat litter box was an hors d’oeurves tray.
My dog would always eat his poop on Eukanua brand dog food. Yuck! I switched to Solid Gold brand dog food. Problem solved. No more poop eating.
Then again, that German Shepherd was not a licker, and not a touchy feely dog in any way.