Constant licking - please help.

I have a 4 year old Bluetick Coonhound. For the past year we have been battling him licking his feet to the point of them being raw. We've taken multiple vet trips, which every "remedy" was a temporary fix (antibiotics, a cone, and an antibiotic ointment). It's like as soon as one foot "heals" he starts on another one. He is too smart for a cone, he either tears them apart or finds a way around it. I've been trying probiotics along with some antiseptic spray, and putting booties on him every time we go outside (thinking maybe he's allergic to dirt/grass?), yet he still wants to lick his feet. Any advice or help is much appreciated, I feel like this is a never ending battle with him but I feel so bad because there must be a reason why he won't stop yet I just can't figure it out. Thank you in advance.   Also, whichever foot he is fixated on at the moment gives off an odor - which I know it can be from a yeast infection - but how can I resolve this and stop it from happening in the future?