Dog Sudoku Level 81 Hint
Find a bone with only two or three available neighboring cells, then test those cells against the row count, column count, and no-touch rule.
Dog Sudoku Level 81 Strategy
Medium Level 81 uses a 8x8 board with 9 bones. Use the row and column dog counts first, then resolve bones with limited neighboring cells.
Dog Sudoku Level 81 Solution
Solution dog cells: R1C4, R1C7, R3C3, R3C6, R5C7, R6C1, R7C4, R8C1, R8C6.