We have had our tortoiseshell cat ruby for a year. She completely rules the roost and can be a bit if a madam putting it mildly. We recently decided to get another kitten and collected Pearl from the RSPCA last weekend. She is a 13 week old petite black and white cutie.
We have done everything the RSPCA advised..introduced them slowly, let pearl explore on her own terms, give them both equal attention, girl pearl somewhere to hide etc but when they are both in the same room ruby completely terrorises Pearl who looks terrified. There's no actual aggression just very obvious domination.
Ruby spends most of her life outside and pearl seems fine when she's not in.
These are our first cats so no idea what it normal.