Our 2-year-old black-lab mix has been constantly scratching around his lower mouth area for more than a week. Can't see any swelling, redness, etc. So far it is limited only to that area of his body/face.
He has been taking FRONTLINE since MAY & once-a month HEARTGUARD-PLUS for heartworm, etc., eithout a break. The Frontline is applied from May to December, every year.