Dog Sudoku Level 159 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 159 Strategy
Hard Level 159 uses a 9x9 board with 11 bones. Use the row and column dog counts first, then resolve bones with limited neighboring cells.
Dog Sudoku Level 159 Solution
Solution dog cells: R1C4, R2C2, R2C7, R2C9, R4C2, R4C7, R5C9, R6C2, R7C8, R8C1, R9C4.