We have 2 cats. A female that we have had 17 years and new cat that is about 1 year old. We are slowly trying to introduce the two. The male cat (1year old) walked up the the older cat tonight and layed his neck over hers as she layed curled up sleeping. She woke up with lots of hissing and ran away. What was the neck thing, aggessive behavior or a show of dominance? We would really like the two cats to get along some day, even if that means ignoring each other.