I'm sure this topic has been discussed to death, but I need some help.We have a 7-year old cat (Abbey) and a new 1-year old cat (Casey) who has been with us for 2 weeks. Our previous cat (Matthew) had to be put to sleep in January at the age of 16 1/2, and he and Abbey were best friends. We know she's grieved for him and misses him (so do we!) and it'll take time for her to accept Casey. He's a playful, happy little thing and would love to play with her but she's just not having it right now. They do sniff each other and he plays while she watches him with a wary eye. They've chased each other around the house a few times, eat near each other but not too close and we put Casey to bed in the spare room so he calms down and doesn't bother her all night. When he gets to be too much she'll hiss at him and has taken a few swipes at him, but then walks away, so we're relieved at that! Casey doesn't seem at all bothered by her and goes on his merry little way being a hyperactive little cat. An interesting side note - Abbey had a mean cat from up the street corner cornered in the backyard last night and ran him off. She then came in the house and went straight to Casey to sniff him almost as if she was checking to make sure he was okay. We've been giving Abbey a lot of extra attention and reassurance and I'm hoping she'll accept him more as time goes on, but does anyone have any advice on what more we can do to ease the process for her? Many thanks for any ideas or advice anyone has - we'll appreciate it!