Doubles are not unusual. ive caught as many as five in one spot at same time... one was the dog fox and four of the offspring. I got female two days later in a scent post set by rear leg close to where i got the five fox. Ive done double on yotes but have seen where other trappers have gotten three at one time in close proximity. Keep trapping and it will happen to you.... BUT only one set wont give you doubles so set accordingly... Good Luck