I am no expert, but this is from a book of trivia I own
"There are two potentially sight-damaging parasites that are sometimes found in contaminated dog faeces. The single celled parasite toxoplasma gondii can cause the disease toxoplasmosis, while the parasite Toxocana canis can lead to toxocariasis. Both can result in blindness"
(similar with cat faeces)
More at p79-80-The Pedants Return, Why Things You Think Are Wrong Are Right
Andrea Barham, Michael O'Mara Books Ltd, 2006.
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