what im about to suggest may appear useless,but i tried it along time ago ,recommended by a old guy,i tried it a hay presto it actually works,for real,no fancy tablets ,just simple ALLOVERA,ITS A PLANT ,just rub on infected area,and leave the rest to nature,doesnt matter if dog licks it,its all natural mate,will do no harm actually you can use on yourself for any serious cuts,hope this helps