"animal hold"

[Odessa Dawn]

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?"

[Rover_KE]

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

Rover