"animal hold"

[Odessa Dawn]

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But the biggest coincidence was their dogs being on the same US flight.
Jenny said: “All four of them were in the same animal hold. "It is like we have been nearly meeting so many times that it makes sense we are twins – like we were meant to be together.”
More: Twins find each other 55 years later...

Does hold in here mean "The lower interior part of an airplane where cargo is stored?"
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[Rover_KE]

Nearly. That's the cargo hold. The animal hold is a separate section.

Rover