DEAR PAW’S CORNER: My cat, Buster, has been scratching under his chin for days, and the skin underneath the fur there is getting raw. What is causing this, and how do I stop the scratching and treat the injured skin? -- David G., Buffalo, New York
DEAR DAVID: It’s clear that something is aggravating your cat and causing him to scratch in just one spot. The problem could be dry skin -- not unusual f…