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When you have more than 2 or 3, it becomes more and more tricky for them to all get along without bullying and behavioural issues like spraying or overgrooming happening

Of course! We have 2, one we had when she was a kitten and a rescue cat, it took around 3 months for them to be ok with each other, they have their moments but get on fine, I cant imagine its hard with 6!!

My latest, who you can read about [here] if youare so-inclined has a peeing problem. It is getting better but he really has stunk up the house. I think he will eventually fit in but there are situations where the cats simply don't get along at all

Oh no!! I guess there is not much you can do about that! I really hope they all get along very soon :)