So Queen Zola is currently wearing a Martingale collar and a regular flat collar for her ID tags. Both are made of nylon. After about a month of having her, my hubby and I noticed that she now has a red ring around the bottom of her neck, where her collars tend to lie when we walk her. We let her stay naked in the house, but I am concerned about the red ring around her neck. Could it be that the nylon material is irritating for her neck and maybe we need to find a Martingale collar made of another material????? Any ideas??? I like that she has a buckle Martingale, for the convenience of getting it off and on… but the redness around her neck is worrying me.