Your new pet will need a constant source of hay as food and bedding to stay healthy. Chewing will also stop their teeth from growing too long. Your pet will also love to munch on veggies like broccoli, cabbage and celery, as well as herbs like mint, parsley, and coriander. If harvesting plants from your backyard ensure they are free of pesticides, as these chemicals can be harmful to your pet. Keep in mind that you should throw out any fruit and vegetables that have been in their hutch for more than 24 hours.
You can also give guinea pig pellets. These should only supplement other items on the menu, and not be the main basis of their diet. Avoid feeding your guinea pig grains, cereals or nuts as this may cause digestive problems.
Guinea pigs are unable to make their own vitamin C. While some vegetables contain vitamin C, you will need to provide your pets with a suitable supplement to keep them healthy.