I had a little chihuahua mix who scratched all the time. I gave him flax seed oil and brewers yeast once a day and he cleared up. Then had a big black cat that lost all of his hair. His skin was clear and smooth. Vet gave him thyroid meds and he grew all his hair back. Have a long hair siamese who pulls out her hair. We have no idea why she started this. My husband shaved her for the summer and decided to let her grow back her hair for winter. Yep, she is pulling it out again. She doesn't scratch or have flakey or oil skin.