How to Make a 9-Month-Old Cat Get Along With a 3-Month-Old Cat

Encouraging your 9-month-old cat to accept a 3-month-old kitten takes time and patience, as most older cats immediately lash out against new roommates. This occurs because the older feline has already established her territory from the day she moved in. She has put her stamp of approval on the house or yard and inviting a newcomer in can make her feel threatened. She might instantly attack the kitten, hiss or hide and wait to strike.

Things You'll Need

  • Cat litter
  • Litter boxes
  • Cat food
  • Water
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Instructions

    • 1

      Separate the cats for the first few days after bringing a new kitten home. Keep your cat in one room with a litter box and let the kitten roam the house. Then place the kitten in the cat's room and allow your cat to roam the house. Prepare two clean litter boxes and separate food and water in each area. The older cat can start to become accustomed to the smell of another animal in the house before meeting the kitten.

    • 2

      Open the door to the room where the kitten resides and allow her to roam around the house freely. Let the cats meet naturally, rather than putting the kitten directly in your older cat's face.

    • 3

      Watch for signs of hostility after the cats meet and separate them again before a fight begins.

    • 4

      Let a day or so pass and then allow the kitten to explore the house again. Eventually the older cat should begin to accept the new feline. She may sniff her and then run off until she feels comfortable enough to lay next to the kitten.

    • 5

      Watch the animals closely as time passes until you feel comfortable enough to leave both cats together without your supervision.