UPDATE: It turns out that the US site still has petites. International sites, however no longer have them (except for denim. But petite denim is available in stores!). The Canadian site also has a petite tab for some of their dresses, but no sizes are available. This is really, really strange. I have sent Anthropologie an email about this, but have not heard back yet. Stay tuned for more!
EDIT: I've added images comparing the Canadian and US sites. As you can see, petites is CLEARLY MISSING on the Canadian site!
Canadian site:
US Site (I circled the petite link myself):
