Chickens haven't layed since dog attack

[aart]

I added supplemental incrementally. It's been in use since the days began to shorten.
Attack in July.
New pullets in August.
Birds have been confined to be sure of no hidden nests.
Birds have all molted.
Coop is designed for 42 birds by square footage.
Oyster shells available.
This is my fourth year keeping chickens.
None are 2 yrs old yet.
Maybe it's time to find a vet that will float chicken poop. Mine doesn't.

Days begin shortening..so end of June?

So pullets were hatched in August?

How big is that in feet by feet?

Small animal vet might do it, mine will, depends on who's working there, call around.
...or heard this place is good....http://www.midamericaagresearch.net/instructions.php