Georgia Boy:
I have most always used a squirt of urine on the backing of a dirthole set. I've experimented with sets made with and without urine many times and I think the sets with urine give a slight decided edge. With the average canine it probably does not add or subtract anything from the set but when a wary old canine comes along it may fool him into thinking one of his own kind or a familiar species was there and everything must be OK. Either fox or coyote seems to work equally well for both species. At least, this is the philosophy behind using urine in addition to lure and/or bait and a little squirt certainly can't harm anything in my opinion. Concerning my lures, the Fox and Coyote #1 Super All Call and #2 Super Range lures are food based with gland, curiosity and passion ingredients added. No bait is needed in addition to this type of lure. I have not used bait in many years, only a smear of this paste lure on the upper rim of the hole and a small gob on a stick on down to the bottom of the hole. My Fox and Coyote #3 Nature's Call lures do not have a food element, only gland, passion and curiosity ingredients. This type of lure I use at sets where there is no hole like flat, blind and post type sets. This is also a great lure at a hole set when used in conjunction with a chunk of bait down the hole. No urine would be used in addition to this lure as the suspicion remover element is already covered in the formula. If I haven't already sent you one, drop me an e-mail at lenon@upmail.com and i'll send you a copy of my lure brochure and price-list which better describes each lure.
Ace