Might be Atopic Dermatitis (Airbone Allergies). Might be yeast, have a look on his tummy where it is clear of hair and you can see easy and see if there is any
pink nodules, like a pimple head. If so it is most probably yeast by the smell you are describing.
You can get sanity in 48 hours if it is yeast from the vet prescribing some antibiotics and ear drops if in there too. Malaseb is a shampoo you might want to try if you do not have $140 to spend as it kills yeast off.
Oh Nutro certainly will not hurt the results
KJ20
