Fruits.
If your guinea pig had diarrea once, then check what it has been eating. maby he/she eat some fruits that a guinea pig can not eat. If you can't find out why this has happend, the best thing to do is to take your guinea pig to the vet. Our vet will tell you why this is happening and treat it.
no and yes it depends on your guinea pig but me I think yes
They like to chew on things, hide, sleep, eat, and squeak.
Your guinea pig can eat banana. They will also choose to eat banana skin.
the guinea pig can eat stems i just dont know about leaves
no.. depending on the guinea pig wether they'll eat it or not
Absolutely NOT it will hurt your guinea pig a lot.Dont try it!!!!!
You can take your guinea pig outside they love that. Just make sure you don't let them eat any exotic plants. They can nibble on grass though. You can also lay on your back on the ground and put a treat on your stomach and see if your guinea pig crawls on you to get it. Another game is to put three plastic Easter eggs in front of your guinea pig. Put a treat in one of the eggs and see if your guinea pig can guess which one has the treat in it. Be creative there is tons of thing you can do.
Yes, humans can eat guinea pig treats. However, if you eat enough of them, you will probably get sick.
Do not feed your guinea pig nuts. It is one of the things on this list not to feed your guinea pig. See related link below for a list of what guinea pigs can and cannot eat.
MAke a maze out of cardboard and have your guinea pig run through it.
you can't, they are very stubborn creatures (unless you train them). the best thing to do is leave the food in their cage. If the guinea pig is injured (for example, when my guinea pig broke her tooth), you can get a special formula (at an exotic vet's office) to syringe feed them.