Do cats have feelings?

I once had a guinea pig named Squeaky. One of my cats used to really enjoy sitting on top on the cage. He would even sleep up there. Eventually Squeaky died. My cat seemed really sad by it. I would see him walk into the room the guinea pig used to stay in and just look around. He would still sleep in the spot where the cage used to be. He did this for awhile after Squeaky died. I know that my cat missed him.

I have always wondered about animal feelings. I think that it is debatable to many people. But in my opinion, animals do have feelings. Like the story above, I have many others that would prove my reasonings.

Of course there are all sorts of websites out there. One could find some supporting the fact that animals do not have feelings, but there are also sites to support that animals do in fact have feelings. This is just one article I found: Do Cats Have Feelings?

What do you believe?