Who do you save, a stranger or your pet?

If you ended up in a situation, on a sinking ferry, flash flood etc, where the choice came down to saving someone you don’t know from drowning or your pet, who would you save if you could only save one before saving yourself? Would it matter more or less the age or gender of the stranger, IE, you might sacrifice your pet if the stranger was a young boy or girl, or handicapped, etc, or would you save your trusted furry friend of many years?