We have a 6mo old spayed female Tabby that we adopted last week. We had previously adopted Muffin, who turned out to be terrified of dogs. We unfortunately had to give her back to the rescue as the situation seemed far too stressful for her. But, we were able to find Tabby, who was fostered with boxers, and we have a boxer, Roscoe, and so she has moved in quite easily with us. She will curl up and sleep with him, and he doesn't seem to mind her at all either. They coexist nicely. The problem that I am concerned with now is that almost every evening she seems to get very frisky with him and takes to swatting his face and sometimes even biting his chest and legs. He has not bitten her back yet, he usually just tries to get away from her, but she chases him and keeps going after him. And she will usually hiss at him as well. I have been reading about some of the cat behaviors and am wondering if I need to put her in a time out for this? I usually put him outside or in my daughter's room where I can shut the door to isolate them. I don't want him to feel punished though since he is not starting the problem. Other times during the day they will sniff around each other, but not really play. But this usually happens at the same time each evening. She does not show this kind of aggression towards us, just to him. What should we do? Thanks