OP,
I hope you are reading all the posts regarding your tragedy. We all feel for you and hope that your pain heals and you try again.
I don't even have chickens yet, but when I have eggs I will gladly send you some, free, if you have the ability to hatch them. If not, I'll hatch them for you and send the chicks. (Anyone got an incubator I can borrow?)
If you find the dog , you can make the owner pay; not only for the hens, but for the feed they ate while in your care and the cost of eggs they would have laid during their lifespan.
Someone said they recovered over 2 grand...which would go a long way toward predetor proofing your chicken's habitat.