I was wondering how I could introduce my 2 cats to my hedgehog? I've been keeping them separated since I got Oliver but I've read that you're not supposed to do that forever? I tried holding Oliver & letting them sniff him, I thought it was going well because they put their noses together & seemed calm. But then randomly Ollie puffed up & started hissing really loud & he climbed up my shirt & hid in my hair. My cats started freaking out as well. Should I try again ? or just not bother...