I will appreciate any input.
I've had Masha, my female cat for 5 years. Couple months ago we brought in a new female kitty (Njusha) and Masha has been under A LOT of stress. They still do not get along at all, although Masha now only hisses when the little one tries to be affectionate...
Oh no, they are not sharing the box! Big cat has her own big box that have been now moved from bathroom. Little one has her own box too, it is smaller with shallow edges, perfect for a kitten.
When I got my new kitten (we already have an adult female cat) she was about 5 weeks old. I just followed a craigslist ad which said kitten were 8 weeks. Turned out it was some sort of a crack house and they owners of this poor babies were selling them for $50 each... well, crack ain't cheap I...