Dog Sudoku Level 155 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 155 Strategy
Hard Level 155 uses a 9x9 board with 10 bones. Use the row and column dog counts first, then resolve bones with limited neighboring cells.
Dog Sudoku Level 155 Solution
Solution dog cells: R1C1, R1C4, R1C9, R2C7, R5C6, R6C3, R6C9, R8C1, R8C7, R9C9.