Hay all the time is good, but they can overeat pellets, fruits, veggies, biscuits, and things like that. So moderate that, but leave the hay all the time.

Oxbow makes little hay biscuits. Otherwise, certain veggies, like peppers, are good for occasional treats.

One of the brands, Oxbow, has a website you can order from. Otherwise, we have some at our clinic. Some pet stores have a variety of brands, so just ask your veterinarian which brands you should go for and which you should avoid.

Guinea pigs eat hay, a lot of hay. They can eat pellets and certain veggies as well.

Guinea pigs are social creatures. So having them kind of in pairs is best if they're bonded. Otherwise, if you can be their bonded pair, they can get lonely because they are social creatures, so ensure they have enough interaction with you or their little buddies.