Good question, my Westie (an adult rescue dog) likes to lick, but he likes to lick many things (metal included, e.g., the metal door on his crate) including his feet, which he does so much they lose hair and become red and irritated.
I just purchased some Bitter Lime and started spraying his feet yesterday. This stuff can be sprayed on many other items, but don't hold me responsible if it stains, I'll soon know if it stains white dog hair.
Feed a balanced diet and have you dog examined by a vet at least once a year... this may include a periodic blood test which may answer your question.
So, did an answer your question? No, will then let me say I don't think it indicates a diet deficiency - but you know what he/she eats, give it some though for balance.
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