I am sorry- it's a tragedy. 20 years ago my first batch of chicks was wiped out by raccoons. I cried for 24 hours straight. I had spent so much time loving them and raising them only to be killed by a predator who didn't even care about eating them. They only killed them. Leaving my house with my dead chicken bodies. It was disgusting and I was disheartenend.
Many years later I tried again, but I was smarter.
You can be mad at the dogs (and I've been mad when wild dogs or coyotes killed my sheep and I've shot them) Or you can be mad at their owners- but most likely they have no owner, but even if they do.... and this is totally against PETA, but it's the nature of things.
LOOK we dont' get furious when our chickens eat a bug,- no -we congratulate them. "Oh My Good Girls!" They are only being natural predators. Yet when their natural predators prey on them we are up at arms.
LEARN WHAT YOUR PREDATORS ARE. Protect against them. It may take several seasons to hit the learning curve. But you will hit it. Don't be hating the dogs because they ate some chicks, my dog loves his chicks and would protect them against anything. (Except maybe a tasty pair of sandals.) He loves them so much he likes to carry them in his mouth!
If you raise 100% of your chicks to a laying age or butchering age, you are in the distinct minority, or you must have been doing this a long time.
l.