I haven’t hunted in 15 years… but we often used fox urine if we were hunting in an area that was prudent to use a drag.
I got to be “the fox” once. Carried a squeeze bottle of urine in my saddle pouch, which I sprayed on a towel, attached to a rope. Set out about 20 minutes before the hunt, and laid a marvelous trail over the 500 acres we had use of, making sure to include all the great cross-country jumps. Hardest part was making sure the drag didn’t get stuck or tangled. Funniest part was having the hounds catch me…