Not knowing what a martingale collar was I went online to have a look ! Whilst there I found this: http://www.bigdogboutique.com/ProductCart/pc/viewPrd.asp?idproduct=9831&idcategory=14 Eleri Pastouret www.bassettissimmo.com http://mascollection.free.fr www.un-coeur-sous-loreille.org