Dog Sudoku Level 121 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 121 Strategy
Hard Level 121 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 121 Solution
Solution dog cells: R1C8, R2C2, R3C5, R5C4, R5C9, R6C6, R7C1, R7C8, R8C6, R9C3, R9C9.