A collar useful in animal care, which includes a closure connector and a flexible belt having a free end and distal therefrom a thickened knob. Anchored within the connector's frame, the knob is disposed contiguous with a narrow slot formed therein through which all of the belt, except the knob, is initially threaded. Once looped back around the connector's frame, the free end is pushed through the frame until it re-emerges therefrom. With the collar adjusted to provide a snug fit, one can then activate a closure mechanism, in which the foot of an arm pivotally connected to the frame clamps a short portion of the belt, across its entire transverse width, against the frame. When the belt is so clamped, pulling on it increases forces pressing the foot against the belt. Cast from a silicon rubber/phosphorescent additive mixture, the belt exhibits luminescent properties, making it visible in the dark.