What could it be

123456789
Across
  1. 1. pup
  2. 3. Impact
  3. 7. Jack
  4. 9. covid
Down
  1. 1. 19
  2. 2. cat
  3. 4. not extinct mammoth
  4. 5. Black
  5. 6. Fallout
  6. 8. Ya Know?
  7. 9. Pickle