Service animals are, not sure if companion animals are without being in a carrier (or on a leash).
I know service animals are allowed but I don't know if your ferret qualifies unless you have paperwork saying she's a support animal..
As far as I know if you have paperwork that it is and emotional support animal they shouldn't be any problems
I believe as long as the animal is an approved support animal (proper ident.) they can't have a problem with it
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