She may be doing this because the kitten smells different after spending a couple of days at the vet. My guess is that she will stop after about a week or so.
Keep in mind that cats can really hurt each other if they want to. So if you see them "fighting," but neither one ends up bleeding, they might just be playing. They might look mad -- hissing, with their ears back -- but if they really wanted to hurt each other, there would be blood. My cats get along great, but they still "fight" all the time. They look really angry, but they don't actually hurt each other. It's just a game they play.
Edited to add: since writing this answer, I have discovered that this is a well-documented behavioral problem. It's called "non-recognition aggression." It's when a cat comes home after being spayed or neutered, and the other cats in the household act like the cat is a total stranger. They may have vicious fights where they really do hurt each other. Usually, the problem resolves itself after awhile, but it could take months.
Do you mean a tabby cat (striped)? Not all cats get along together and any time you introduce cats there's going to be a time of hissing and growling before they adjust. So yes, a tabby cat Can get along with another cat, but it's no guarantee.
Experiment and find out
yes
no
Mesopotamia.
Yes! You do have to decla war before attacking or else there is no war and the opponent wouldnt know about it. If the opponent doesn't know about it there really is no war and nobody wins.
To do it before General "Winter" arrived.
You should have at least two soldiers before attacking another player. If you only send one soldier it will automatically die. However, at different stages in the game, the base number to attack with will increase due to the increased defense of your opponents. It is strongly recommended to scout the opponent before attacking.
Moving by stealth into attacking positions.
I could'nt tell you if i tried.
No, there is no talking to them.
cover your hands in baby food or peanut butter. IDK about attacking dogs, but it teaches puppies not to bite.