It's not really a stretch to label "unclean" an animal that eats its own feces.
Corprophagia is actually a pretty effective method our keeping a litter clean. A nursing dog will stimulate her puppies to defecate and if she can't carry the stools away from the litter she will eat them. Canine gastric acidity can drop below pH 1 to handle this.
The behaviour might be hygienic for the dog, but not for the humans interacting with it.
I feel like this is some kind of meta comment about the tech industry :-)
Makes you wonder about the contents of dogfood ;).
The health implications aren't as bad with herbivores
Um, yeah I suppose that's one way of way saying. In actually, the health implications are good for herbivores AND other less efficient digestive systems like those in the rodent family.
The prove that there is no intelligent designer ;)