Hi all, know this is an old thread but I do want to share the same problem I am facing now...I just adopted a kitten (shld be few months old) last saturday and introduce him to my babe cat Roo.
Roo has been hissing and merajuk since then. He wont go to his toilet, wont eat at the same place, and will kurung himself in my room...
I will need to feed him in my room, take him to his toilet area...
When I pet him, he acts normal but after a while he will let his "grrr" sound...
In the meantie, the kitten I adopted is constantly in his hyperactive state....running , playing, and wouldn't mind Roo at all...
I will try to "cium" kan both of them soon.....I hope it'll work....