[
  "Draw a bar model. Let total animals be 10 units (LCM of denominators 2 and 5).",
  "Dogs = 1/2 = 5 units. Remainder = 5 units. Cats = 4/5 of 5 = 4 units. Dogs - Cats = 1 unit = 10 animals.",
  "Hamsters = remaining 1 unit = 10. Answer: 10 hamsters."
]