Ancol Claret Squares Adjustable Collar Ancol Claret Squares Adjustable Collar – Repeating modern square pattern in teal tones combined with a luxury claret nylon webbing. Comes with traditional antique gold fittings. The Ancol collars are 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 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 the collar.