Where do dogs go in planes?

I live in the UK and have been on holiday (vacation) many times and have never once seen a dog or any animal on a plane but I was coming home from Spain with my boyfriend and his family today and I saw a pet dog and its owners past security at the airport. My boyfriends mum was surprised as she didn't know dogs... show more I live in the UK and have been on holiday (vacation) many times and have never once seen a dog or any animal on a plane but I was coming home from Spain with my boyfriend and his family today and I saw a pet dog and its owners past security at the airport. My boyfriends mum was surprised as she didn't know dogs were allowed to fly. I had heard of it in America but hadn't seen it happen in Europe before. It wasn't on my flight but I wondered where would it go, would it go in the cabin with its owners or would it go in the cargo?
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