in my survey - I measured the legnth of the bandana that fits Keegan well.
She wears a 22 inch collar and as long as there is plenty of room on each side to tie it - like 3 inches each way it should fit - those regular bandanas that you can buy in the store are what fits her well. I would say for dog with a 22 inch neck - the bandana needs to be at least 28-30 inches.