Stopping A Dog From Licking A Wound?

Last week, my Jack Russell got pretty torn up in a dog fight and most of his cuts and bruises have healed up pretty nicely.  Except one on the back of his neck, our littlest dog will NOT leave it alone.  Woobie just keeps picking and picking at Jack’s cut, and I fear it’ll never heal.

At a loss for what to do to keep him away from it, my husband’s solution this morning when he called was to tie something around Jack’s neck to keep the other dogs from picking at it.  So I tried:  I tied one of my husband’s old bandannas around his neck.  He doesn’t seem to mind it, and had not picked at it at all – But it hasn’t stopped Woobie from trying to lick his neck, he just slides it down far enough to get at the cut.

I’m running out of ideas here.  I can’t constantly carry Jack around with me, he’s too dang heavy and squirmy.  And I can’t keep them all crated all the time, nor do I have anywhere to separate them.  So I’m asking – Does anyone know how to keep dogs from licking wounds? I've heard there are some herbal supplements that may work, but I'm wary of using them.

I fear if it doesn’t start looking better soon – he’s going to have to make a trip to the vet, in which I’ll get a lecture for not bringing him in sooner…  Hmm… maybe if I actually liked my vet, I wouldn’t try to avoid him.