I've got a 9 year old cat Female Tink ! She's always been very clean and loving. My daughter has had a kitten at 8 weeks old , Pixie. since this Tink won't come in the house unless we pick her up and bring her in, we feed her outside and she's hissing at Pixie and us . This has been the same since June Pixie is now 6 months and still Think won't come in . I've tried all the usual tips , introducing slowly through glass doors in separate rooms, smells ,plug ins !! Don't know what else to do , worried now as weather getting colder and don't want Tink out in the cold