I used to bathe my german shepherd anywhere from 5 to 10 days, depending on itchiness. I used a sulfur shampoo for dogs, but head & shoulders dry scalp worked also. Back then, there was a spray called Gentocin that really helped his hot spots and feet. I think there is a new, better product. When his skin began to ooze and get pink (not a full on hot spot) one spray and in 20 minutes it calmed down.
I also did a skin test for allergies, I think it helped but not cheap. At least it gave me a tool for label reading!
