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Why is it called a dog collar?

In the United Kingdom (and other British-influenced countries, such as Canada), clericalcollars have been informally referred to as "dog collars" since the mid-nineteenth century. The term Roman collar is equivalent to "clerical collar" and does not necessarily mean that the wearer is Roman Catholic.

Do calming collars really work for dogs?

Yes, pheromone collars do work—in the sense they reduce your dog's anxiety and stress. Pheromone therapy won't change your dog's behavior though. I've heard some pet owners swear that using an Adaptil diffuser (pheromone therapy wall plug-in) stopped a puppy from pottying in the house.