Big feet run in my family. I wear a size 9, my sister wears an even bigger size 11 and my dad's shoes are big enough to sail in to Hongkong. Ok, so I'm exaggerating just a bit. Probably big enough for a Chihuahua. Or a few guinea pigs.
Edited to add that the purple one is mine and the blue one is 5.5 year-old Gael's. Just in case you haven't figured that one out.