As requested, here's an update on how my poppy is doing.
The bloom that got knocked off tried valiantly, but was not quite ripe enough to open fully. This was about as far as it got:
However, good news! The plant outside had a couple more flower shoots. Both have escaped dog damage (so far) and have flowers opening up. One only has three petals, which I don't think is typical. I'm wondering now if they are self fertile?
You can see why I couldn't resist them!
In case you were wondering that is sea beet and parsley going to seed around them.