scratching schnauzer

by Deb
(USA)

I recently adopted a schnauzer, appx 5 days later he started scratching incessantly. I counted him turning around on his bum 30 times. Took him to vet, we changed his food, still this went on. Took him to vet again and he was put on steriods.Findly I called prior owner and was told, the dog had had allergy testing and skin scraping yet nothing turned up to tell why he was scratching. Prior owner finally figured out the dog was reacting to dust mites and if she kept dog on a product like Frontline (walmart carries a similar one) the scratching stopped. Ive since heard many times about dogs scratching from dust mites but little info is on the internet for people . Id like to get this info out there for all these dog owners who cannot come up with anwsers to the dogs problems