Dog Sudoku Level 51 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 51 Strategy
Medium Level 51 uses a 7x7 board with 6 bones. Use the row and column dog counts first, then resolve bones with limited neighboring cells.
Dog Sudoku Level 51 Solution
Solution dog cells: R1C2, R2C5, R4C1, R4C3, R7C4, R7C6.