Footrot wil lshow up as a whitish, cheesy base to the foot, once you clean off any mud. There's also a distinct smell. Heat in the foot suggests perhaps a grumbling inflamation that's suppressed but not eliminated by the doses of anti-inflammatory and a/bs. Are the a/bs something like Alamycin LA or 5 days of Pen & Strep, to maintain the level of a/bs in the system for a worthwhile period?