Dogs eat cat Feces all the time
then people let them lick their faces
Human infection with Toxocara, the parasitic larvae of canine or feline roundworms, is known as visceral larval migrans (VLM) systemically and ocular larva migrans (OLM) when it affects the eye.
Two nematode larvae can cause toxocariasis. Both are round worms found in the intestines of dogs (T. canis) and cats (T. cati). About 20% of dogs release Toxocara canis in their stool. Patients can become infected after accidentally swallowing infective Toxocara eggs from larvae in soil or other contaminated surfaces. Puppies usually contract Toxocara canis from the mother before birth or from her milk. The larvae mature rapidly in the puppy's intestines and when the pup is three or four weeks old, they begin to produce large numbers of eggs that contaminate the environment through the animal's stool. The eggs soon develop into infective larvae. Contraction occurs from ingesting contaminated soil or feces.
Once ingested, the eggs hatch and larvae penetrate the intestinal wall and are then carried by the circulation to various tissues--liver, heart, lungs, brain, muscle, eyes--via blood and lymph. Ingested eggs may remain viable for years. While the larvae do not develop further in these sites, they can cause severe local inflammatory reactions.
With the ocular form, one or more larvae become trapped in the eye, causing a granuloma in the retina. The nematode may reside beneath or within the retina, or it may extend into the choroid or vitreous. It may remain viable for several years in the eye. It can cause blindness.
I love Dogs but I wish people would not let them lick the faces of children