4x4 cats and dogs puzzles
These Pawmoku 4x4 library puzzles have 16 tiles, with 4 tiles in every row and column. A finished line needs 2 cats and 2 dogs, without three matching neighbours. The one published so far starts with 7 animals and takes 9 steps to finish.
Solving 4x4 boards
With only two of each animal per line, a matching pair fills its share at once. Count the short rows and columns after every move.