I was dismayed to read an article about a 4-5 foot anaconda traveling through sewers into toilets in Arlington. But some of the language in the article became what one would normally say about a stray dog. I'm surprised people are allowed to own these things.
http://wtop.com/arlington/2017/01/anaconda-found-arlington-co-apartment-toilet/
While the yellow anaconda is not venomous, the species can be dangerous when they reach full size and are not well socialized.
During the rescue, the anaconda — which the animal control team named “Sir Hiss” — was scared of the situation, instead of aggressive.