Sorry, that’s not correct. They do transport pets in the cargo bays, and liquids and other things that would be ruined by freezing.
Depends on where. They don’t climate control the hold that takes dead folks in the shipping container for out of state burial.
They aren’t all heated. And the ones that are can fail. Had a dead dog as a result in it’s carrier, and we had paid to light sedate before, so no compensation.