
Someone I know had a Cavalier with irritalbe paw -always licking it and discolouring. They put some thornit in a small palstic bag, put the foot in and shook it about a bit, twice a day for a week or so. Dog never was inclined to lick the paw when it was coated in thornit, and irritation cleared up there and then. Dont know if this would be the officila answer from Thornit, but it worked for them.
bye
Gwen