Dog Sudoku Level 90 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 90 Strategy
Medium Level 90 uses a 7x7 board with 7 bones. Use the row and column dog counts first, then resolve bones with limited neighboring cells.
Dog Sudoku Level 90 Solution
Solution dog cells: R2C1, R2C6, R3C3, R5C4, R6C7, R7C2, R7C4.