Dog Sudoku Level 40 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 40 Strategy
Medium Level 40 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 40 Solution
Solution dog cells: R1C1, R1C3, R1C6, R1C8, R4C1, R4C3, R5C8, R6C6, R7C2.