No she should be fine, only thing with adult biscuits that's different to puppy biscuits is the fat and protein content. I took my GSD off puppy biscuits at 5months old because she didn't want them.
So now she is on large breed adult and gets raw lamb or beef mixed with it, she is super healthy, looks wonderful. I also have her on fish oil and a skin formula, because she has allergies as well. I had somebody suggest local honey on here for allergies, it has to be within a 50km radius. So my girl gets that mixed through her food too, she doesn't hardly scratch anymore and her coat is incredible
Best of luck
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