Dog Sudoku Level 123 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 123 Strategy
Hard Level 123 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 123 Solution
Solution dog cells: R1C9, R2C1, R2C6, R3C4, R5C1, R5C5, R5C8, R7C9, R8C3, R9C1, R9C6.