What workarounds did people try for "Older cat still hissing at new kitten after months"?

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Community members documented 53 workarounds:
1. Keeping the cats in separate rooms most of the day
2. separating the cats
3. Giving the older cat high places and personal space to retreat to
4. Redirecting the kitten when it gets too annoying
5. Using soothing pheromones like Feliway
6. Waiting for months or up to a year for them to adjust
7. Feeding cats on opposite sides of a closed door
8. Holding both cats simultaneously to keep them in proximity
9. Using a temporary cat net or baby gate
10. Opening the door slightly while blocking it with a heavy object
11. Buying more toys
12. Separating the cats and doing scent swaps
13. Feeding them on opposite sides of a closed door
14. Conducting slow, controlled play sessions with treats
15. Using plug-in pheromone diffusers
16. Giving each cat individual attention and alone time
17. Start with scent before face to face meeting by introducing each cat's scent on a piece of clothing separately.
18. Keep cats completely separated on the same floor for about two weeks.
19. leaving the younger cat outside during blizzards and hoping to let him in for the winter
20. considering contacting a shelter
21. Keep the kitten in a separate spare room with necessities like a litter box, food, water, and bedding when left alone.
22. Allow the cats to interact only when someone is present to supervise.
23. Wiping the kittens down with a wet wipe to remove strange clinic smells
24. Rubbing hand towels on the kittens and then on the resident cat to transfer and mix scents
25. Using short bursts of supervised time together
26. Scent swapping using blankets
27. Following the Jackson Galaxy introduction method
28. Using a mesh screen divider between rooms
29. Intervening to redirect the kitten's energy toward toys
30. Adding cat shelves and escape routes around the cat tree
31. Allowing the interaction to continue if it appears safe
32. doing slow scent swapping with towels and room rotations
33. using barrier meetings with carriers or partially open doors
34. feeding them together
35. using cat pheromone plug-ins
36. giving them time to figure each other out
37. re-directing the persistent cat to other toys or activities
38. playing more with the energetic cat
39. allowing time and doing separation or isolation
40. Doing scent swapping with items
41. Allowing the kitten to explore the common space
42. Feeding them with a closed door between them
43. sending the kitten to stay with a friend
44. considering rehoming the kitten
45. Separating the kitten into another room when the older cats get annoyed
46. Introducing the cats gradually in steps so they get used to the new scent
47. Trying to manually tire out the hyperactive kitten with play
48. Giving them more time to figure the hierarchy out naturally
49. Keeping them in completely separate rooms initially
50. Scent swapping blankets before face-to-face meetings
51. Using snacks and food as positive reinforcement
52. Letting them sort it out without micromanaging interactions
53. Playing with the cats at a visual distance to build positive associations

Older cat still hissing at new kitten after months

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