My moms shitz tzu has it bad too... The vet/groomer has instructed her to give him 25 mg of bendryl/ per day when it is really bad. Also bathe with psoriasis shampoo such as denorex or head and shoulders intensive treatment ( it is in a navy blue bottle) weekly and to give him 1 Tablespoon of linburger cheese every day.... oddly enough... the linberger cheese seems to really help and keep most of it at bay.