It’s often a local phenomenon due to breeders in the area and a small viral effect. People see others with a dog breed they like and want the same. In my area it’s huskies, in my previous home town it is German shepherd’s because there is a trainer specific for that breed. Aussies are a hit everywhere though.
I only ever had dogs from shelters and many people ask what breed that is and then are a bit sad to learn they cannot have the same one because they are just random.
Kubricks Napoleon