That's due to the oil barrier. I like That concept, want I had thought of it!! However, that's, I now 3D print cat food bowls that have a really little, canted inward oil ring, which prevents kittie's fur from accidentaly getting oily. It works really well and is simple to https://codyxgtdm.bloggosite.com/43499414/pet-corner-dubai-an-overview