Dog Sudoku Level 53 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 53 Strategy
Medium Level 53 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 53 Solution
Solution dog cells: R1C1, R1C4, R2C6, R2C8, R4C1, R4C7, R6C3, R7C1, R8C8.