Dog Sudoku Level 171 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 171 Strategy
Hard Level 171 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 171 Solution
Solution dog cells: R1C1, R2C6, R3C1, R3C3, R5C2, R6C4, R6C6, R6C9, R8C1, R8C6, R9C8.