Oily Coat Along Spine of My Sammie

The last two times my Sammie has been groomed the groomer has mentioned his oily coat. It’s the area from the base of his tail to halfway up his back, along the spine. Our vets have no idea and we’ve cut some of the oil supplements out of his raw diet and groom him regularly but just have no idea.

His general health is excellent for a 12 year old, good movement, although a little slow to get up at times, blood screens good, no diabetes but going deaf and has glazed eyes.

Has anyone elses’ Sammie suffered with this.