Crossword - Who is the fastest?

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Across
  1. 3. man's best friend
  2. 5. hot season
  3. 7. a number
  4. 8. a tree
  5. 9. cold season
  6. 13. a big animal
Down
  1. 1. a car
  2. 2. cats like to chase
  3. 4. a color
  4. 5. has long and thin body
  5. 6. like horse
  6. 10. a white animal
  7. 11. Hint（提示）: body part
  8. 12. a sport