Hair loss?

[Chubs 0]

What type of collar do you have on her Chub's, could quiet simply be rubbing the hair off especially if she has smooth skin underneath, usually with a skin complaint the skin would not be smooth.

No collar on her, when i noticed the hair loss i took it off & she hasn't worn one since (months), After reading up on this as much as poss i think it is quite possible she has a zinc defiecency, all the signs are there & it is common in english bull terriers, she has the hair los, reddening of affected skin, scaley crusty skin on legs, spots around mouth & can sleep for england.

I'm changing her to a raw wheat free diet, i've dosed her with advocate on the off chance it's mites that weren't picked up on the scrape, changed my washing powder & bought a 2kg powder form sa37 & zinc tablets come tomorrow. I thought i'd change it all & then change one at a time & see what she responds to. If anyone thinks i'm doing this wrong or has any more ideas/tips i'm all ears here! I must add she's in no discomort what so ever it's entirely cosmetic & only affeting her jaw/throat.