This can be looked at from several directions, the multiple levels give the guinea pig more exercise and tend to keep it entertained longer, it is also a good idea if you have multiple guinea pigs. Some owners however are worried of the guinea pigs falling and injuring themselves so making sure the levels are low enough so your Pet is not injured in a fall is a good idea.
Try to put them in a small cage together.
Yes! Most guinea pigs love to be together and will be happier and livelier. Just make sure that the cage is big enough, and that the guinea pigs are the same sex.
a great place to get a guinea pig cage is probably Amazon or Craigslist.
it depends on what cage you have in my opinion. If you have a cage from the pet store i think bedding but if u have a c&c cage where you can make it as long as you want fleece is the best because you only vacuum and replace the sheets. seriously think fleece is better though
if it gets REALLY REALLY bad possibly. if the cage is pretty dirty,it could make the guinea pig sick or it isn't good for him/her. Most likely it wont kill the guinea pig.
Guinea pigs don't always make people itch. If they do, then it probably means that you are allergic to the guinea pig, the hay you feed it, or the sheddings in it's cage.
That depends on the sort of disease the pig has. To keep it healthy give it lots of veggies with vitamin C and all other sorts of vitamins. Make sure it allways has fresh water in it's cage and make sure the cage is clean.
I prefer already built cages over custom built ones as they tend to last longer. I got my guinea pig's cage here http://www.petproductsbyroyal.com/rabbit-guinea-pig/
Just get a big cage from a pet store that has little hiding places in it. Guinea pigs like to hide in small dark places. Rabbit cages would be okay to use too, but make sure you keep your guinea pig inside. Make sure that the bottom of the cage is smooth for the guinea pig. Wire at the bottom of the cage is too hard for it to walk on and painful. Also, get some shavings/bedding (little pieces of cut up wood or get it from a pet store) to line on the bottom of the cage that will make a comfy bed for your pet.
Yes, the cage should be kept clean and "worm free."
no all you need to do is make sure you kep his or hers cage clean
It depends. They certainly wont be aggresive, but if you do, make sure to spay and nueter them.