Dog Sudoku Level 91 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 91 Strategy
Medium Level 91 uses a 8x8 board with 9 bones. Use the row and column dog counts first, then resolve bones with limited neighboring cells.
Dog Sudoku Level 91 Solution
Solution dog cells: R1C6, R1C8, R2C1, R3C5, R4C7, R5C1, R5C3, R5C5, R8C8.