Racoons will avoid a property where dogs live. We lost a whole flock three months after our dog died.
Get some barking dogs....
I have three dogs. The husky will fight anything that comes into the yard. The mix has a voice that echoes through the whole neighborhood. They do not like raccoons.
They also don't stop raccoons. The raccoons come back if the dogs aren't outdoors with the chickens. So just having dogs around, even raccoon aggressive dogs, will do nothing if they can't be out with the chickens when the raccoons are out too.
So this is probably not totally accurate advice to give. FWIW.