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Cats are my favorite and second fav would be guinea pigs since they can be funny in how they eat and when they smell food and stand on two feet like a gopher. Allergies is a sad thing but mice can be fun. Hamsters seem to act very similar to mice more than guinea pigs. I had my cat, Honey, in a cage for a few minutes or at times with my guinea pig, Ra Ra Hercules Roberto and they kind of like were friends maybe slept together back in the year 2000 when I was 15. Pets tend to make friends with each other, generally. Maybe not all animals can but at least cats and dogs and maybe a few other pets can get along more than they would out in the wild it seems.