It's not really recommended to keep rabbits and guinea pigs together because of problems that often occur.
Some include:
- Fighting
- Rabbit sitting on the guinea pig resulting in suffocation
- Zoonotic Diseases
I have two dwarf lops, one being housed with a guinea pig at a previous home before.
I don't house the same rabbit with my guinea pigs but I let them out on the grass together, they tend to keep their distance and not bother each other at all. When they do go near each other, they don't seem fussed at all.
My other dwarf lop can't go near them or my other rabbit. She's a rescue and extremely aggressive towards other animals, so when she gets floor time, she goes out individually and seems to like it that way.
Also even if you got two dwarf rabbits, you'd have to ensure the sex of them, and get them neutered as after 6 months of age, they very territorial.