Dog Sudoku Level 86 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 86 Strategy
Medium Level 86 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 86 Solution
Solution dog cells: R1C5, R2C2, R4C3, R4C5, R4C7, R7C4.