A museum of dog collars

Leeds Castle has a Dog Collar Museum.

Mrs. Gertrude Hunt most generously presented her collection of collars to the Leeds Castle Foundation in memory of her husband, John Hunt, the distinguished medievalist.  The collection of over 100 collars and related exhibits has since been added to and enhanced by the Foundation itself. Spanning five centuries, the collection contains examples of collars from fearsome fetters for the great hunting hounds of the past, to canine couture for 21st century pooches.

Photo by AMALY, via The Telegraph's photo essay on The World's Most Boring Museums (lawnmowers, pencils, soap, wallpaper, Spam, mustard and others).