This matches what I've seen... My previous dog (RIP, Caleb) hated crows and would bark and lunge at them on our walks. So every time we came out, one would caw

This matches what I've seen... My previous dog (RIP, Caleb) hated crows and would bark and lunge at them on our walks. So every time we came out, one would caw out the alert and crows up the road would echo the alert to more distant crows. The crows did the same thing with my next dog. But the first time he saw crows on the road, he did his greeting dance -- the same one he uses to try to get people or other dogs to come over to meet him. And that was it, the crows immediately understood and stopped alerting from then on. (Not entirely a happy ending, though. The crows never did come over so Jack could meet them).