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Now that it's springtime, I've been letting Tabby go outside again (on her leash - we live in an apartment building). The neighbours both have cats - the one side has two older, and larger cats who stay inside but sometimes come to the door. On the other side there's a younger cat - probably about 6 months old who goes out on his leash too.

Tabby is very very aggressive to her neighbours. She can get closer to the younger one, since they're both outside, and literally throws a hissy fit on him. Meanwhile, the little guy is just minding his own business, playing around. She hisses at the older ones on the other side, but she's not so bad with them since 1) they're inside and she's out and 2) they're bigger than her.

I realize that this is most likely a territorial problem, but what can I do about it? I would like to get another cat eventually, but I don't want to have to worry about Tabby being aggresive towards it as well. How can I get her to behave herself?