Okay, what food are you feeding? Top dollar doesn't necessarily mean grain free. Diamond naturals, victor, Merrick all are great.Also, coconut oil is amazing for their coat. You can add a tbsp. of it in their food or apply it topically. I prefer in the food as you don't want the grease stains all over your house. Try Ivomec (ivermectin)....if you are not familiar with it Google it. You can purchase it online or your local feed store if you have one close to you. Your vet will not tell you about it. Also, use oatmeal washes only. I prefer Oster. My female gets this when seasons change. Don't know why might just be her own type of allergies. Blue or grey dogs have been known to suffer from skin allergies. I know Nu-stock will help you tremendously. 
If you need any help or have any questions please feel free to contact me. I'm glad to help in any way I can. I spend a lot of time researching all kinds of issues. I share a lot of helpful links on FB. If you want to add me please feel free. Just let me know and I'll add you.
I hope this was helpful.

If you need any help or have any questions please feel free to contact me. I'm glad to help in any way I can. I spend a lot of time researching all kinds of issues. I share a lot of helpful links on FB. If you want to add me please feel free. Just let me know and I'll add you.
I hope this was helpful.
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