Maintenance is easily done, all you will need is leather wax polish, which is a greasy colourless product. Once rubbed in this will fill in the creases and flatten the folds, bringing back the colour and keeping your collar supple at the same time.
Leather wax polish is applied using a soft cotton cloth, applying it using a circular movement. If you notice the collar absorbing the wax quickly, meaning your collar is dry and could be damaged more easily, then applying a little more wax will be necessary.
A word of advice if your dog loves to swim in the sea. Please take the DWAM collar off prior to the swim, as the leather collar will be damaged by the sea water preventing you (and your dog) from enjoying it for as long as you could.
What size fits my dog?
Measure the current collar and check the size chart