When deciding whether to fly or take the train on a trip, the cost of putting your pet in a boarding facility while you are away is irrelevant.
A trip is defined as the act of traveling somewhere and coming back, particularly when on vacation. This means that the person is traveling from one destination to another.
As the person in both the cases that is the flight and the train will have to travel and leave the pet behind in both cases.
So, he has to look for a boarding where he can place the dog for some time and pay for the same.
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