Originally Posted by navyydragon
My boyfriend and I have been introducing a new kitten to our seven year old cat for the last week and a half. We keep the little guy in a kennel at night in his own room where the older cat can't get into, and the kitten is not allowed in our bedroom as that is Thora's domain. At first, she would smell around the outside of the door and then go about her business. I figured this was good, since none of her behaviors had changed and she still seemed comfortable knowing another cat was around. Things turned bad when we started bringing him out for short supervised visits. Thora seems interested in him, and cautiously approaches him, but when he gets too close, she will hiss at him and then run away, and things aren't improving. Now, she will follow him around, corner him, and bat at him. We are worried to leave them alone, and I can't think of anything to make this easier except time. If you have any suggestions on how to avoid these aggressive confrontations, please help!
Aside from its kennel at night, does the kitten have his own safe zone during the day? If not, I would put the kitten in an area where he can be safe from the older cat. Make sure the kitten has his own /food and water and litter box with him in his safe zone. The litter box should be small enough so that the kitten can easily get in and out of it.
Whichever room you decide to put the kitten in, you will need to let him out occasionally so he can have a chance to explore the rest of your house a bit to help him feel at home. When you do this, put Thora in the kitten's area while the kitten is out exploring. This will give Thora a chance to smell the kitten's area and to get used to his smell. When you do this avoid Thora spotting the kitten so there is no confrontation. You may have to do this patiently for about a week.
When you do allow them to see each other, keep the "visits" short and supervised, making it clear to Thora that yes you love her but that you love the baby too. Putting a drop of vanilla on the back of their tails and neck will help tremendously because they will both "smell" the same and this will help them accept each other faster.
If you don't have vanilla you can always give them a very light quick spray with your cologne. It has to be a very very light spray (you don't want their fur getting wet in any way because of the alcohol).
Make sure to hold the bottle at least 2 feet away from them, if you do this.
The idea is to get just enough of a scent on them to trick them into thinking they smell the same. Using the vanilla is preferable though and that too just a tiny little drop.
You also mentioned that you are keeping the kitten out of your bedroom because it's Thora's domain. This is fine temporarily, but it can't become a permanent situation as this can cause division between them. In time one of the two will become the "alpha" cat and they will sort things out between themselves. You can't interfere with that and you can't restrict one but not the other.