Tiffy, please call the airline and tell them it is an ESA. You might print up a tag to hang on it's container (that fits under the seat in front of you)... put it in fine print, but put the truth. They don't have to allow it, but most want to be able to. If you that IS your carry-on, and you are quiet and polite when speaking to them, being honest, odds are they will let it fly in the cabin.

Don't be afraid to ask them to ask the pilot if they can make an exception, should they insist no emotional support animals in cabin. If you tell them about your panic disorder, and how the animal calms you, they probably will want one for every passenger!

You might be required to pay a $50 fee for the ESA to fly in cabin under the seat. IDK GOOD WISHES ON THIS FLIGHT!

No Tiffy must have a letter from a mental health professional and give 48 hours notice that the dog will be flying, otherwise they are not supposed to allow it. As long as the letter is satisfactory and dog if well-behaved no carrier is needed. Tiffy also should not be charged to fly with her ESA. The airlines are required to allow it. Make sure you bring the ACAA regulations and calling before to make sure you have everything you need to make it as easy as possible. Just remember when you get to your destination that you need to stay at a pet friendly hotel and pay the pet deposit.