MUCHO'S CROTCHETS

My parents' dog Mucho likes to bark at these things.
  1. Squirrels
  2. Pit bulls
  3. Crows
  4. Cats
  5. Skateboards
  6. Slow bikes
  7. Recumbent bikes
  8. Draw brodges
  9. Blimps
  10. Fighting
  11. Higs
  12. The sloth
  13. Doorbells
  14. Fax machines
  15. Staplers