the best crossword ever

123456
Across
  1. 1. needs to scratch things to keep its nails sharp
  2. 2. likes to roll in mud
  3. 4. mythical creature that says roar!!
  4. 5. eats fruit upside-down
  5. 6. it poops everywhere
Down
  1. 1. looks like a fat wombat
  2. 3. a horse that has a horn
  3. 4. 4-legged animal that likes chasing sticks