Now I know your not going to agree with me, but, Ive been in lurchers for a long time now, and seen a few feet injuries during that time..
When its been a dog belonging to me I tried everything..If its jumped it will probable mend, but dont let it stiffen, keep spraying it with some for on linament, preferably a spirit linament. If it broken, get it cut off, it will take about the same time to heal as would a jumped toe, and you will ghet less trouble when its fully healed. If its broken, and you just give it time to heel, I will look for another post in 2 months time to say your dog is sti