Last spring, my neighbor’s toddler ended up in the ER with something called toxocariasis. Never heard of it? Neither had I, until the doctor explained it came from parasites in dog poop. The kid had been playing in their backyard where their two labs did their business. One handful of contaminated dirt, one absent-minded finger in the mouth, and boom—three weeks of medications and a $4,000 hospital bill. That was my wake-up call. Living in…