I have two Border Collies, one m one f; the big male stays at home guarding while i'm at work and the little girl goes to a friends for the whole weekend . . . Trouble is my friend has been nursing a small staffy pup and my two have got the mites he has had since birth ! This all seemed to coinside with my dogs' annual booster vaccinations all three dogs are being treated by the vets with a course of extremely expensive spot ons every four weeks and a corticosteriod for the affected areas Has anyone else had a similar experience or can you offer any tips on getting rid of them quickly ?