Feed them separately. Different rooms or crated, as already suggested. It's really the simplest solution
Anything left in the bowl after they stop eating gets put back up out of reach until next feeding.
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Amy and the dogs,
Jack - male GSD b. 8/9/10
Lillian - female Weimaraner b. ~2005
RIP Mattie - female GSD 10/18/02 - 7/24/2013