to me benzyl is the best thing out there but all the chemists i have gone to have stopped selling it and said they cant get it in any more, even a well known bloke who could get nearly most things cant get it either, has anyone else had problems getting it, i was at a very well known terrier man afew year back showing him a bitch i had who got mange quite bad during rearing pups and had past it onto 2 pups and he said it was something to do with something in the blood, he gave my bitch a jab of some kind and with in afew days you could see a difference, could anyone tell me what it could of be