Re: cats in picyures make me MAD!
I believe people who say that their cats couldn't care less, and wouldn't bother the pigs, because I don't believe mine would either. He's more scared of them than they are of him!
In general, I think most cats know what they're capable of "taking on"--mine won't even attack a spider that he thinks is too big. (Obviously there are cats that are more aggressive hunters than some.)
When I built my cage, I wasn't sure how the cat would adjust to the pigs, and so I made it *extremely* secure and catproof. And while I'm glad I did, and wouldn't suggest otherwise to anyone...honestly, if it was completely open, I don't think the cat would ever enter it.
At first, he liked to lie on the back of the sofa, staring at the cage ("watching guinea pig TV", I liked to call it!
), until he fell asleep. Now he's bored with even that. The only time he's ever put his paw in the cage is when he wants some of the fresh grass I put in for them!
In the beginning, I'd never leave the pigs out on the floor with the cat in the room. Now, while I wouldn't leave them alone for hours or anything, I think nothing of a trip to the kitchen and back or something. That may seem controversial to some, but I do believe that people know their pets and can gauge their moods, etc.
But I do also agree with the "you never know" sentiment. They ARE animals, afterall, with sometimes uncontrollable instincts and reactions. So I don't think you should get complacent, or take for granted that they will always "get along".