[
  "Draw a bar model. Let total animals be 18 units (LCM of denominators 3 and 6).",
  "Dogs = 1/3 = 6 units. Remainder = 12 units. Cats = 1/6 of 12 = 2 units. Dogs - Cats = 4 units = 12. So 1 unit = 3 animals.",
  "Total animals = 18 units x 3 = 54. Answer: 54 animals."
]