A chinchilla’s diet is built almost entirely on hay and a small portion of pellets, with very little room for extras. About 75 to 80% of what your chinchilla eats each day should be grass hay, supplemented by a measured amount of commercial pellets. This simple formula mirrors what wild chinchillas eat in the dry, sparse grasslands of the Andes mountains, and getting it right is the single most important thing you can do for your pet’s health.
Why Hay Is the Foundation
Grass hay isn’t just food for a chinchilla. It’s also their dental care plan. Chinchillas are one of only five rodent species whose teeth never stop growing, including all of their back teeth. Without enough coarse, abrasive plant material to chew on, those teeth overgrow and develop sharp spurs that cut into the tongue and cheeks, a painful condition called malocclusion. Hay forces chinchillas to grind their teeth in a natural side-to-side motion that keeps the surfaces worn evenly.
Timothy hay is the most widely recommended option and the easiest to find at pet stores. Orchard grass, oat grass, and brome are also good choices. You can rotate between them or offer a mix. The key is that these are all grass hays, which are lower in calcium and protein than legume hays like alfalfa. Alfalfa hay contains too much calcium and protein for adult chinchillas and should only be fed to chinchillas under six months old or to females recovering from giving birth. For every other chinchilla, stick to grass hay and offer it in unlimited quantities so your pet can graze throughout the day and night.
How Their Digestion Works
Chinchillas are hindgut fermenters, which means most of the real digestive work happens late in the process, in a large pouch called the cecum. The cecum accounts for about 22% of a chinchilla’s entire digestive tract, and it’s packed with specialized bacteria that break down plant fiber into fatty acids the chinchilla uses as a major energy source. This is why fiber content matters so much: without enough of it, the bacterial community in the cecum falls out of balance, leading to bloating, soft stools, or more serious gut problems.
Chinchillas also practice coprophagy, meaning they eat a special type of their own droppings called cecotropes. These soft, nutrient-rich pellets are coated in a layer of mucus that protects the beneficial bacteria inside from stomach acid, allowing those microorganisms to cycle back through the gut with minimal loss. It looks strange, but it’s a normal and essential part of chinchilla digestion. If you notice your chinchilla eating droppings directly from its body, that’s healthy behavior, not a sign of a problem.
Pellets: How Much and What to Look For
Pellets make up the smaller but still important portion of the diet. A good commercial chinchilla pellet should contain 16 to 20% protein, 15 to 30% fiber, and 2 to 5% fat. Look for plain, uniform pellets rather than mixes that include dried fruit, seeds, or colorful bits. Those extras are too high in sugar and fat, and chinchillas will pick them out and leave the nutritious pellets behind.
Most chinchillas do well on roughly one to two tablespoons of pellets per day. Offer them in a heavy ceramic bowl or a wall-mounted feeder to keep them clean. Because chinchillas are crepuscular (most active at dawn and dusk), evening is a natural time to refresh their pellet supply. Hay, on the other hand, should always be available regardless of the time of day.
Safe Treats and Foraging Options
Treats should be genuinely occasional, not a daily habit. A chinchilla’s digestive system is built for low-fat, low-sugar, high-fiber food, and even small amounts of rich treats can cause digestive upset over time. The safest options are dried herbs and flowers: rosemary, hibiscus, dandelion root, dried rose hips, dried marigold flowers, and strawberry or blackberry leaves all work well. Offer a pinch-sized amount a few times a week at most.
Dried rose hips are one of the best choices because they provide a small amount of natural vitamin C without excessive sugar. You can scatter dried herbs around the cage to encourage foraging behavior, which keeps your chinchilla mentally stimulated.
Foods to Avoid
The list of unsafe foods is longer than most new owners expect. Seeds, grains, and nuts are all off the table because of their high fat content. Chinchillas cannot handle much dietary fat, and even a handful of sunflower seeds can trigger digestive problems. Citrus fruits like lemons and grapefruit are too acidic. High-water-content fruits like watermelon can cause diarrhea. Corn, chocolate, and dairy products are all unsafe.
Yogurt drops deserve a specific mention because they’re widely marketed as chinchilla treats. They’re loaded with sugar and dairy, neither of which belongs in a chinchilla’s diet. Fresh vegetables are another common mistake. While a tiny piece of carrot or a single raisin won’t cause an emergency, fresh produce introduces more moisture and sugar than chinchillas are designed to process. Dried herbs are a safer alternative in almost every case.
Water Needs
Chinchillas drink relatively little water compared to other small pets, typically 30 to 40 milliliters per day depending on the type of food they’re eating. That’s roughly two to three tablespoons. A glass water bottle with a sipper tube is the best delivery method because it keeps the water clean and prevents the chinchilla’s dense fur from getting wet, which can lead to skin problems. Change the water daily and clean the bottle regularly to prevent bacterial buildup. If you notice your chinchilla drinking significantly more or less than usual, that’s worth paying attention to, as sudden changes in water intake can signal dental pain or digestive issues.
Calcium and Mineral Balance
One reason alfalfa hay is restricted for adult chinchillas is its calcium content. Too much calcium relative to phosphorus can contribute to bladder stones, while too little leads to weak bones. The ideal calcium-to-phosphorus ratio in a chinchilla’s overall diet falls between 1:1 and 1.7:1. A diet built on grass hay and quality pellets generally hits this range without any need for mineral supplements or salt licks. Adding calcium-rich foods on top of an already balanced diet is more likely to cause problems than prevent them.