A guinea pigs diet should consist of mostly high quality hay and fresh grass. This should be on hand if possible for them every day. Guinea pigs naturally graze on grass and small plants such as herbs and dandelions. Its very important for the overall health of your guinea pigs to have a significant amount of hay and grass and will help to prevent issues with their teeth and digestive systems as well.
But, your guinea pigs will need more than just hay and grass to live a healthy long life, so it is recommended to give them high quality pellets designed for the exact their exact needs. Most manufacturers will pack them with a high level of Vitamin C which is crucial for your piggies!
Oxbow Essentials Adult Guinea Pig Food is a great option for all natural guinea pig pellets.
In addition to these foods, your guinea pigs should also have plenty of fresh washed greens like broccoli or kale. Feel free to chop them up into easier to handle smaller portions, your piggies will love this! There are many other vegetables such as cucumbers, bell peppers, and celery that can be supplemented in as well.
Finally, as tempting as it may be to give your piggies a sweet treat like a fruit or some vegetables, it is important to ration these out. They are generally not for every day or even every other, so be careful and talk to your veterinarian if you have specific questions!