Beware of the Dog by Fred Piscop

Across 1. Sentry's imperative 5. Knocks out of one's socks 9. IHOP serving 14. "Essays of __" 15. Big picture 16. 34-Across became one 17. Hamper contents 18. Zilch 19. Bowie's last stand 20. Put an early end to 23. Give a darn? 24. __ chi 25. Western topper 27. Sent, as to a military outpost 32. Grate stuff 33. Give two thumbs down to 34. Onetime "97-pound weakling" Charles 36. Doo-wop group member 40. Obey the drill sergeant 44. Beat by a whisker 45. 1960 Wimbledon champ Fraser 46. Schooner contents 47. Graffiti, to some 50. They manage the wines 52. Flock leaders 56. WWE outcome 57. 39, to Jack Benny 58. Get destroyed 64. Conical abode 66. Scotto solo 67. Social reformer Baker 68. Maze word 69. Creditor's claim 70. Bartlett's abbr. 71. Windows icon 72. "__ we forget ..." 73. Carpet features

Down 1. Chopped down 2. Jai __ 3. Daffy's problem 4. Gauguin's island home 5. Pursued, as a career 6. Colorful fish 7. Left or right of the goalposts 8. Replacement players, to some 9. Jazz cats' wear 10. Business card abbr. 11. Gather together 12. Intaglio's reverse 13. Like an open secret 21. Bother persistently, as an injury 22. Actress Hagen 26. "Oh no, not __!" 27. Basilica part 28. A natural abrasive 29. Negotiations hang-up 30. Verve 31. Tests for carbon 14 35. ER shout 37. Bull artist 38. Snitched 39. Till fill 41. Bog stuff 42. Seuss's Horton, for one 43. Tyro, informally 48. Steamboat builder Fulton 49. Angular opening? 51. Like vicuñas and llamas 52. Party spreads 53. Smiley or Smart 54. Nasal partitions 55. Play for time 59. Lackawanna's lake 60. Spots for tacks 61. Radius neighbor 62. Hardly four-star cuisine 63. Catches some rays 65. Occupational suffix

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