Hi All! First post here as we have been fine with our cats upto now and don’t really understand their current behaviour. As far as I can research, not affected by common factors. I’ll give you the full story anyway.. My wife and I have two 7 year old tortoiseshell sisters, Daria and Liz. Daria is big and boisterous. Really playful, really loving but quite independent too as she spends most of her time asleep in one of our two bedrooms. Daria is really small, always quite unsure (refuses to use a bigger scratching post we bought). Always really needy but really does always want attention on her own terms. They share a litter tray and various food bowls with no hassle. Only recently Daria has taken to hissing at Liz on a regular basis. Usually when Liz enters a room (usually our living room) where she is already sat with her on the sofa or when passing each other in the hallway. I don’t know why this has happened all of a sudden at this stage and doesn’t seem to be fighting over food or anything. My thoughts would be that Daria has a nice comfy time going on and doesn’t want Liz to be involved (we always have to play with them separately as Liz is far more lively). Any and all advice is appreciated. Thanks!