Thanks, I should make sure to keep an eye on them for a while :] I had Ruf for 12-13 yrs before we got Jo, but he's so calm and well behavied he'd never do anything anyway, so I wasn't sure what to expect. I know when we brought Patches to my moms house to live with us a while, my cat Smitten HATED her at 1st. The kitten was to young to understand I guess, but Smit just hissed 'till they got to know each other. I guess it's the same with most animals :]