I use one from the front and one from the back and I don't put any blood on the hooves, only a few drops on along the trail. You want the dog too follow the scent of the hooves as they may not always be any blood!. If the hooves are a few days old I will put slits in the bottom of them.
@ Nell come on mate you must have a picture of your self in these or if not in the old platforms. I hope they are not the Gary Glitter type silver
Why one front and rear?