8x8 cats and dogs puzzles
These Pawmoku 8x8 library puzzles have 64 tiles, with 8 tiles in every row and column. A finished line needs 4 cats and 4 dogs, without three matching neighbours. The 19 published so far start with 12 to 18 animals and take 46 to 52 steps to finish.
Solving 8x8 boards
Four of each animal belong in every line. Revisit both directions after each placement: a new animal can settle a distant tile through a line's remaining share.