I brought home a kitten a little while ago. After letting her get settled in I decided it would be a good time to bring in my other cat for her to see. Well it was a good thing i was holding my older cat cookie because he was not happy about seeing another cat in the house. He hissed at her and tried to jumpout of my arms. What should I do next? also he has not been eating very much so we are going to the vet as soon as i can get him in