Thank you for your reply!
These signs are often related to either anxiety and this is how anxiety is manifested, with aggression - or these are related to dominance behavior.
Often when they are first introduced into the house - one recommendation would be to give each cat their own blanket/toy.
After allowing the cats to play with their blankets/toys, you can then switch the blankets, then allow each cat, while apart to play with the other cat's blanket so they can smell each other and get a sense of their new friend before the actual meeting.
Since it has been months, I am not sure that will be terribly effective.
When this becomes a problem where they are not getting along as well as you would like after their introduction period - there is a product called Feliway (click here)
that emits hormones/phermones which is reported to reduce stress as another option for you.
This link may also help (HERE
I hope this information helps :)
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The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would highly advise contacting your regular veterinarian.