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Regardless of whether I will use Frontline or Advocate, I won't be buying it from the vet as the price difference is just too great. Still undecided as which one to choose, OH thinks we should change to Advocate, for the protection against lungworm and sarcoptic mange, but I am still not sure as I don't like to put any necessary chemicals into Alfie and if I then have to give a general all purpose wormer as well as the Advocate as it doesn't cover tapeworm, this is increasing the amount of chemicals he has and as I have said we have no problems with Frontline Combo spot on at the moment, he also shows no interest in slugs or snails, so I am not so worried about protection for lungworm, but it is really the sarcoptic mange that worries me. A friend's dog locally had mange but she was at the time having treatment for a tumour which will probably have knackered her immune system leaving her open to things like SM and Alfie is in good health, so not sure how worried about the possible threat of SM I should be. Thanks for all your replies so far, keep them coming, it is good to hear other people's views on this.