Can My Pet Eat This? The Ultimate Small Pet Food Encyclopedia – Small Pet Select U.S.

Having a small pet around brings so much joy, from their hilarious middle-of-the-night wheel runs to those sweet, quiet snuggles. The only catch is that they have delicate digestive systems. Even a small dietary mistake can sometimes lead to harmful digestive upset or require veterinary care.

If you have a guinea pig, chinchilla, hamster, or rabbit, knowing what to put in their food bowls and what’s off-limits should be one of your top priorities. In this guide, we’ll also cover how frequently your little friends can safely eat treats.

Small Pets Diet Cross-Comparison Table

While rabbits, guinea pigs, hamsters, and chinchillas have distinct dietary needs, certain rules apply to every small pet.

How Small Pet Digestive Systems Work

To keep your little ones healthy, you’ll need to know how their bodies process food. A diet that energizes a guinea pig can harm hamsters. Their digestive systems simply work differently.

Hindgut fermenters vs. omnivores

Bunnies, piggies, and chinchillas are hindgut fermenters. Their systems require a constant flow of fibrous material to keep moving. They rely on specialized bacteria in their cecum (a pouch-like organ connected to the intestine) to break down tough plant fiber through fermentation.

Hamsters, on the other hand, don't depend on cecal fermentation to process most of their food. As omnivores, they can digest numerous foods, including seeds, grains, leafy greens, and even small insects.

Why fiber matters

For hindgut fermenters, fibrous hay isn't just another nutrient; it's essential to survival. It keeps food moving through the digestive tract, reducing the risk of dangerous blockages. Chewing hay also wears down their continuously growing teeth, helping prevent painful and often expensive dental problems.

Introducing new foods

Changing a pet's diet too quickly can upset the delicate balance of beneficial bacteria in its gut. When introducing a new food, always start with a small portion size for several days. During that time, watch your little one’s appetite, energy levels, and droppings.

If anything seems out of the ordinary or your pet develops unusual stools or signs of digestive upset, stop feeding the new food and contact your veterinarian for guidance. Introducing foods gradually gives the digestive system time to adjust and can help reduce the risk of digestive problems, including GI stasis.

What Rabbits Can Eat

What you feed your rabbit isn't the only thing that matters. How it's prepared is just as important. Some foods become difficult to digest if seeds or pits are left in them, whereas unwashed items may carry harmful pesticides or other contaminants that could make them sick.

Hay

Hay should make up the largest portion of a rabbit's daily diet, accounting for at least 80% of what it eats each day. Hay can naturally vary in color, and some batches may include green, golden, brown, or yellow tones. These differences are often due to growing and weather conditions at the time of harvest and don’t necessarily indicate poor-quality hay.

1st Cutting Timothy Hay: High in fiber, with fewer flower heads and tougher stems, this batch is harvested early in the season. It's ideal if your rabbits need a little weight management, maximum dental wear, or gut stimulation.
2nd Cutting Timothy Hay is leafy with flexible stems and a healthy amount of seed heads. It's the most sought-after option for adult bunnies.
3rd Cutting Timothy Hay: This one is a late-season harvest. Undeniably soft, leaf-heavy, and contains almost no stems. It has less fiber but is high in protein and fat, making it ideal for underweight or elderly rabbits, rather than for daily feeding of healthy adults.
Orchard hay: You can try the sweet-smelling Orchard Hay if your rabbit is allergic to timothy hay.
Oat hay: You can also offer Oat Hay to rabbits that enjoy a crispy texture.
Alfalfa hay: Alfalfa can be fed sparingly only as a treat but it is much higher in calcium, carbohydrates, and protein. It’s recommended for growing buns up to around 7 months of age who might need them to improve their nutrition.

Rabbit pellets

Rabbit Food Pellets provide the essential vitamins and minerals many rabbits need for a strong immune system, but they should be offered in moderation. Also, you have to factor in your rabbit’s age, weight, and metabolism.

Adult rabbits typically need fewer pellets than growing kits, and some healthy adults may not require pellets at all when their nutritional needs are met through a balanced, hay-based diet. Younger buns (between seven weeks and seven months) can have Alfalfa-based Pellets that are formulated for growth.

Your veterinarian is the best resource for determining your bunny’s specific dietary needs.

Safe leafy greens and herbs

Fresh leafy greens and herbs can provide hydration, variety, and important nutrients. Offer a varied rotation of rabbit-safe greens, such as romaine lettuce, cilantro, parsley, basil, and other leafy herbs. Avoid iceberg lettuce, which has little nutritional value compared with darker leafy varieties.

Many rabbits also enjoy freshly washed dandelion greens. They can be included as part of a varied diet, although rabbits with a history of urinary or calcium-related concerns may need individualized dietary guidance from a veterinarian.

Fruits and vegetables

Treats high in natural sugars must remain occasional rewards to prevent obesity and bacterial overgrowth in the cecum. Limit non-leafy vegetables to one tablespoon per 2 pounds of body weight per day. Leafy vegetables shouldn’t exceed 75% of the fresh portion of your bunny’s diet.

Carrots: Carrots are dense in sugar; you can offer small slices sparingly.
Apples: Sweet and crisp! Be sure to always remove their seeds as they contain toxic cyanogenic glycosides.
Berries: Blueberry, raspberry, and sliced strawberry are the highlights here; however, offer sparingly.
Bell Peppers: Green, red, and yellow bell peppers provide a crunchy Vitamin C boost.

Herbal blends

Forage blends like Heavenly Green Crunch and Blue Cornflower Foraging Herbs, made with ingredients such as dried plantain, chamomile, oat tops, and mint, are great sources of vitamins. They also support digestion and encourage natural foraging instincts.

Rabbit-approved commercial treats

Many rabbits love dried goodies like Pea Flakes and Apple Slices. Hide a small amount in hay, toys, or scatter around their play area for a fun foraging adventure. Offering a balanced variety of healthy treats also helps build a great bond between you and your pet. Be aware that treats should be fed sparingly and should never exceed 5% of their daily diet.

Water

Alongside hay, your bunnies also need regular access to clean, fresh water, preferably in a heavy ceramic bowl since it encourages natural drinking posture and won't easily tip over. Water bottles or drinkers can also be used, but they may restrict how quickly a rabbit can drink, be harder to keep clean, and require regular checks to ensure the spout is flowing properly.

Toxic and unhealthy foods for rabbits

Certain common items can cause rapid organ failure or severe GI blockade.

Honey and molasses: Honey or molasses, as excess sugar and calories can slow digestion and cause stomach upset.
Avocado: Contains a toxin that can cause heart failure and respiratory distress.
Iceberg lettuce: Offers zero nutritional benefit, high in lactucarium, a chemical compound that acts as a sedative.
Fruit pits and seeds: Pits or seeds from fruits like plums, cherries, peaches, or apples contain traces of cyanide that can cause lethargy, restlessness, or breathing difficulties in rabbits.
Rhubarb: Packed with high concentrations of oxalic acid, rhubarb can lead to kidney failure.
Chocolate and caffeinated items: Rabbits metabolize stimulants far more slowly than humans do, which can rapidly spike their heart rate and cause serious medical emergencies.
Human junk food: High-starch, high-sugar snacks like crackers, bread, and sugary cereals disrupt the cecal bacterial balance, often leading to GI stasis and severe digestive slowdowns.
Yogurt treats: These can be found marketed for rabbits, however, they aren’t an appropriate choice. Rabbits aren’t designed to digest dairy, and these treats are often high in sugar, which can disrupt the delicate balance of bacteria in the gut.

Feeding Your Guinea Pigs

Guinea pigs cannot process Vitamin C on their own because they lack a key liver enzyme. That means every bit of Vitamin C they need has to come directly from their daily meals. A typical adult needs between 10 mg and 30 mg each day, though pregnant or sick cavies usually need more. Your veterinarian is the best source to determine your piggy's individual needs.

When a guinea pig runs low on Vitamin C, they can get scurvy, suffer from painful joint swelling, and develop respiratory problems.

Fresh greens and vegetables

Avoid adding liquid Vitamin C drops to your guinea pig's water bottle. Ascorbic acid degrades quickly when exposed to light and water, leaving an unsavory taste that makes many cavies stop drinking altogether. Fresh vegetables can be an excellent source of Vitamin C and hydration as part of a balanced guinea pig diet.

Green bell peppers make a great daily staple because they're low in sugar. Red, yellow, and orange peppers have even more Vitamin C so you can rotate those into the bowl every few days. For leafy greens, stick to romaine, cilantro, red leaf, or butterhead as your daily base.

Offer higher-calcium greens like parsley and dandelion greens in moderation, especially for guinea pigs prone to urinary issues. Kale can also be part of a varied rotation rather than an everyday staple. Calcium is an important nutrient, and it’s important to note that bladder stones are influenced by several factors, not calcium intake alone. You can also throw in raw zucchini slices or a bit of cucumber, but keep cucumber portions small to prevent loose stools.

Hay and pellets

Fresh hay needs to make up the bulk of your guinea pig's daily diet. High-quality hay is especially important because it provides the fiber needed to support healthy digestion and helps wear down continuously growing teeth through natural chewing. Keep hay fresh and available at all times, as it helps encourage guinea pigs to eat consistently throughout the day.

Pellets are meant as a small supplement, making up just a fraction of their daily food intake.

Stick to plain, uniform pellets, as pellet mixes with seeds, nuts, and dried pieces can encourage selective eating and may contain ingredients that are too high in fat, sugar, or starch for guinea pigs. For balanced food pellets fortified with stable Vitamin C, Small Pet Select offers Timothy-based pellets for guinea pigs.

Age plays a huge role in the type of feed you pick. Young cavies up to around six months of age need Alfalfa-based pellets for extra calcium and protein while growing, whereas adult cavies over six months should stick strictly to Timothy-based pellets. If you have a pregnant or nursing cavy, consult an exotic veterinarian to adjust their daily intake.

Fruit rewards

Many fruits should be treated as an occasional treat rather than a daily part of a guinea pig’s diet because of its high natural sugar content. Offer only a small portion up to a few times a week, such as a thin slice or few small-sized pieces, depending on the fruit. Too much fruit can contribute to digestive upset and unnecessary sugar intake.

An occasional seedless orange slice is fine, but citrus can irritate their mouth if offered too frequently. Kiwis offer plenty of Vitamin C but carry a high sugar load, so keep those portions small. When feeding berries, half a strawberry or two blueberries is plenty for one pig.

Dried herbs

You can sprinkle dried forage mixes like Linden, Berry Burst Blends, and Echinacea directly over timothy hay to encourage their natural foraging instincts.

Packaged treats

Packaged treats can add variety and enrichment to your guinea pig’s routine. Treats can help provide foraging opportunities and bonding moments. Hard-baked goodies like Healthy Snackers and Timothy Hay Cubes give your guinea pig a crunchy surface to help wear down their continuously growing teeth.

Check the ingredient list and look for simple, recognizable ingredients, while avoiding treats with added sugars such as honey or molasses, as well as artificial colors or unnecessary additives.

Foods you should avoid

Allium vegetables: Onions, garlic, chives, and leeks may destroy red blood cells in cavies, causing severe anemia.
Iceberg lettuce: It offers no real nutritional value and can cause diarrhea.
Potatoes: Raw potatoes, sprouts, and eyes contain solanine, a natural toxin that can cause stomach distress and damage the nervous system.
Dairy products: Steer clear of yogurt drops, cheese, or milk treats. Guinea pigs lack the enzymes to digest lactose, which can trigger harmful gut issues.
Seeds and nuts: These foods are too high in fat and calories for guinea pigs and can be difficult to digest as they don’t fit their natural, high-fiber herbivorous diet.

Feeding Your Hamsters

Unlike rabbits and guinea pigs, hamsters are omnivores with fast metabolisms. Their main diet consists of plant matter like seeds, grains, and vegetables; however, they can also digest animal protein, including small insects.

A balanced hamster diet should provide complete nutrition while also supporting natural foraging behaviors. Depending on the foods you choose, this often includes a nutritionally complete hamster pellet of lab block alongside a varied seed mix.

High-quality pellets

Hamsters are notorious selective eaters. If you give them just seeds, they will pick out their favorite oily seeds and leave essential nutrients behind. Pellets prevent this issue by providing your pet with balanced nutrition in every bite. Look for hamster-specific food with approximately 15-20% protein, and follow the manufacturer’s feeding guidance for your hamster’s species, age, and individual needs.

Seeds

While seeds shouldn’t make up your hamster’s entire diet, they still play an important role. When offered in moderation as part of a balanced diet, a varied seed mix can provide enrichment by encouraging natural behaviors such as foraging, sorting, and husking.

Safe veggies and fruits

Fresh produce can add variety to a hamster’s diet, but they should make up a small portion of what your hamster eats. Introduce new foods gradually and offer small portions a few times a week. All treats and supplemental foods should make up no more than 10% of your hamster’s overall diet.

Examples of hamster-safe fresh foods:

Bell peppers: A good lower-sugar option that also provides Vitamin C. Offer a small piece, with the stem and seeds removed.
Broccoli: Small pieces of raw broccoli can be offered occasionally as part of a varied diet.
Cucumber: Provides hydration and can be offered in small amounts, especially as an occasional fresh addition.
Zucchini: A mild, low-sugar vegetable that can be offered in small pieces.
Leafy greens: Small amounts of options like romaine lettuce or other hamster-safe leafy greens can add variety.
Carrots: Safe in small portions, but best offered occasionally because they contain more natural sugar than many other vegetables.
Apples: Offer only a small piece with the core and seeds completely removed.
Bananas: Because bananas are high in natural sugar, offer only a very small amount occasionally.

Chews and forage

Your hamster's front teeth grow continuously, so providing safe materials and foods to gnaw can help support normal tooth wear and natural chewing behaviours. Forage trays filled with dried Nettle, Dandelion root, meadow grass, or burdock root can encourage natural foraging and chewing while adding enrichment to their environment.

Unsweetened Banana Chips, dried Cranberry Apple bites, or timothy hay rolls topped with Cornflower can be offered as occasional treats or enrichment. Because dried fruit contains concentrated natural sugars, portions should be kept small.

Some dwarf hamster species, particularly Campbell’s Russian dwarf hamsters and hybrids, have a greater predisposition to diabetes, so sugary foods should be especially limited for them.

Foods to avoid

Your hamster's cheek pouches extend back toward the shoulders and are used to carry and temporarily store food. Because the pouches can become impacted or injured, it’s important to offer foods that are safe and appropriate for hamsters.

Sugary and sticky foods

Avoid heavily sweetened foods and products containing xylitol, which is toxic to pets. Sticky foods may also be difficult for hamsters to manage or remove from their cheek pouches, so foods such as sticky candy or large amounts of peanut butter are best avoided.

Citrus fruits

Citrus fruits such as oranges, lemons, limes, and grapefruit are generally best avoided or limited in hamster diets. Choose small amounts of other hamster-safe fruits instead.

Raw kidney beans

Raw kidney beans should not be fed to hamsters. They contain naturally occurring lectins that can cause gastrointestinal illness.

Almonds

Almonds are high in fat and aren’t necessary in a hamster’s diet. Bitter almonds should never be offered because they can contain harmful cyanogenic compounds.

Garlic and onions

Members of the Allium family should not be fed to hamsters. Allium plants contain compounds that can damage red blood cells in some animals.

Chinchilla Nutrition

A chinchilla’s digestive system is highly specialized for a high-fiber diet. Native to the dry, mountainous regions of the Andes, chinchillas are adapted to eating fibrous grasses and plant material that are relatively low in fat and sugar. To support healthy digestion, their diet should center on unlimited high-quality grass hay, a measured portion of chinchilla-specific pellets, and constant access to fresh water.

Loose hay

Your chinchilla should have unlimited access to fresh, high-quality grass hay every day. Hay provides the long-strand fiber needed to support healthy digestion and encourages the natural chewing that helps wear down continuously growing teeth. Depending on your chinchilla’s preference for softer or coarser hay, you could offer Timothy Hay 1st Cutting, 2nd Cutting, or 3rd Cutting.

If you aren’t sure what kind of hay your chinchilla prefers, try a Sampler Hay Box with oat hay, orchard hay, and Timothy hay.

Pellets

Pellets should supplement, not replace, your chinchilla’s hay. For most adults, a small measured daily portion is appropriate, with the exact amount depending on the pellet and your chinchilla’s individual needs. Choose chinchilla-specific food pellets with balanced fiber, protein, fat, vitamins, and minerals. Avoid mixes with seeds, nuts, or dried fruit, which can encourage selective eating and add unnecessary fat or sugar.

Safe treat options

Timothy Hay Cubes: One of the simplest treat options because they’re made from compressed hay and add variety without added sugar.
Dried herbs and botanicals: Small amounts of chinchilla-safe options such as rosehips, hibiscus, dandelion, or Nettle can add variety and encourage natural foraging.
Dried fruit: Options like Goji Berries or Apple can be offered very sparingly because dried fruit is concentrated in natural sugar.
Plain Rolled Oats: A very small amount can be offered occasionally as a simple treat.

Why Chinchillas Should Avoid Fresh Foods

Refrain from feeding your chinchilla fresh fruits, raw vegetables, or wet greens as a regular part of their diet. Chinchillas are adapted to a dry, high-fiber diet, and fresh produce can introduce excess moisture, sugar, and starch that may contribute to harmful digestive upset, including soft stools, gas, or changes in gut motility.

Watery or sugary fruits such as watermelon, oranges, grapes, and fresh apples are best avoided or kept out of the regular diet. Instead, focus on unlimited grass hay, a measured portion of Chinchilla-specific Pellets, fresh water, and small amounts of appropriate dried treats.

We recommend consulting your chinchilla’s veterinarian, as they are the best resource to provide safe food recommendations tailored to your pet’s individual needs.

Other forbidden foods

Nuts and seeds: These are high in fat and aren’t appropriate as a regular part of a chinchilla’s diet. They may contribute to excess calorie intake and digestive upset.
Corn: Corn is high in starch and isn’t a good fit for a chinchilla’s high-fiber diet, so it’s best avoided.
Animal products: Dairy, eggs, and meat are not appropriate for chinchillas, which are herbivores and are adapted to eating plant-based foods.
Raisins: Raisins are very high in concentrated natural sugar and should be avoided or offered only extremely sparingly, if at all.

Conclusion: Create An Informed Feeding Routine For Your Small Pets Today

Feeding your pet a safe, balanced diet starts with understanding the nutritional needs of their species and providing the appropriate foundation, such as high-quality hay, species-specific pellets or food, and fresh water. When offering treats, you can scatter small portions around their enclosure or tuck them into forage areas to encourage natural searching and foraging behaviors.

Introduce new foods gradually and monitor your pet for changes in appetite, energy, droppings, or behavior. If your pet eats something potentially toxic or develops symptoms such as lethargy, persistent soft stools, bloating, or loss of appetite, contact an exotic-animal veterinarian promptly.

Can My Pet Eat This? The Ultimate Food Encyclopedia for Rabbits, Guinea Pigs, Hamsters, and Chinchillas