The cause of Plummer-Vinson syndrome is unknown; however, genetic factors and nutritional deficiencies may play a role. Women are at higher risk than men.
Soothes itchy ears. Diluting apple cider vinegar with 50 percent water provides a solution for a common dog problem: itchy ears. Just use a cotton swab or gauze pad soaked in the diluted vinegar. If itchy ears continue, your dog may be allergic to something in his diet.
Yes, I think you could use apple cider vinegar on your small dog. Always dilute. Use 1/2 water and 1/2 vinegar. If skin is broken, use even less vinegar. Maybe 2 Tablespoons in a cup of water.