Ancol Adjustable Chocolate Squares Collar Ancol Adjustable Chocolate Squares Collar – Rich chocolate nylon base with a beautifully coordinated flower and heart ribbon design. Comes with traditional antique gold fittings. Adjustable in all cases so that a fair degree of flexibility exists between the sizes. The adjustability of the collar means that for every dog there will be at least two collar sizes that will be acceptable and also of comfortable fit. Ensure the collar isn’t too tight, it should be loose enough to fit two fingers between your dog’s neck and also the collar.