Our male cat ( 6 months) is on his own as his sister died recently. We thought we would get another girl in for him to play with. We have all been very upset and thought it would redress the balance.
Also for background: We had horrid feral cats in the neighbourhood and there had been a couple of run ins in the past as one had a litter in our garden the day the other two arrived.
So: we have been proceeding slowly. Separate rooms, swapping beds after 4 days and now bringing him in 2 or 3 times a day. 1st time he hissed and tried to attack, now he hisses and then bolts for the door. How much time should we be putting them together? Should we keep themin a room together or let him escape after 15 seconds? The little new kitten is fine, in fact, although a timid little thing generally, she ran to him to play.