Jake, never tried one fox hunting, but I have one on an AR that has a very small dot and is very adjustable as to brightness... the Bushnell TR25 is great, one on the AR, another on the slug gun for deer, and a spare cause the price was right...
I do think it wouldn't be the thing to have for fox at night... the Muellers with the dot makes for very precise shooting at night... just line up the three dots and squeeze it off, DRT... the one thing I don't particularly care for with the Muellers is target shooting in the daylight... in my opinion the dot doesn't have the preciseness of a cross hair...