Are you asking about Amtrak, Metra or Chicago "L" trains?
If you are talking about the el, it is enforced. It is relatively easy to "sneak by" though. However, they don't have to be in an official "carrier". I used to put mine in my backpack. They just want the dog contained.
Thanks that's what I needed. I will bring packs to put them in.
Yes I saw that I just need to know how they define a carrier or if it is even enforced.
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