What Do Bunnies Eat? The Ultimate Comprehensive Feeding & Nutrition Guide

Feeding a domestic rabbit correctly is single-handedly the most vital responsibility of rabbit ownership. Unlike dogs and cats, which are carnivores or omnivores, rabbits are obligate herbivores with a uniquely delicate, specialized digestive tract known as a hindgut fermentation system. In the wild, rabbits survive on low-nutrient, high-fiber vegetation including coarse wild grasses, bark, roots, and weeds. Domestic rabbits maintain this exact physiological requirement. Providing an improper diet—such as feeding excessive grain mixtures, commercial seed mixes, sugary fruit treats, or insufficient fiber—is the leading cause of life-threatening gastrointestinal stasis, severe dental disease, and obesity in companion rabbits.

To keep your bunny vibrant, active, and healthy throughout its natural lifespan of 8 to 12+ years, you must mirror their natural physiological design. A balanced daily rabbit diet consists of five core components: unlimited high-fiber grass hay (80–85%), fresh daily leafy greens (10–15%), high-fiber plain pellets (5%), fresh clean water, and very small, controlled treat portions. In this comprehensive guide, we examine every component of a rabbit's dietary needs, explain how their complex digestive system processes fiber, detail life-stage feeding adjustments, and provide actionable feeding charts you can implement immediately.

The Biological Foundation: How a Rabbit's Digestive System Works

To understand what bunnies eat, it is essential to understand why they eat it. Rabbits possess a specialized digestive architecture designed to process large quantities of fibrous plant material efficiently. Unlike ruminants such as cows, which possess multi-chambered stomachs to ferment food early in the digestive process, rabbits ferment plant material in their cecum, a large blind pouch located at the junction of the small and large intestines.

The cecum acts as an internal fermentation vat populated by billions of beneficial microflora (bacteria and yeasts). As food passes through the digestive tract, indigestible long-fiber particles stimulate intestinal motility (peristalsis) and are expelled quickly as hard, round, dry fecal pellets. Meanwhile, digestible short-fiber particles are diverted backward into the cecum, where microflora break down cellulose and synthesize essential B vitamins, amino acids, and volatile fatty acids.

This process produces a secondary, nutrient-dense stool called cecotropes (often referred to as 'cecal pellets' or 'night feces'). Cecotropes look like tiny, glossy clusters of dark grapes with a distinct pungent odor. Rabbits practice cecotrophy—they consume these cecotropes directly from the anus, typically during early morning hours. Ingesting cecotropes allows the rabbit to pass these fermented nutrients through the stomach and small intestine a second time, absorbing vital protein, vitamins, and fatty acids that would otherwise be lost. Disrupting this cecal bacterial balance through high-sugar, low-fiber diets causes dysbiosis, soft unformed cecotropes, severe pain, and potentially fatal GI stasis.

Component 1: Unlimited Grass Hay (80–85% of Daily Diet)

Grass hay is the absolute cornerstone of a healthy rabbit diet. It must be provided in unlimited, unrestricted quantities 24 hours a day, 365 days a year. A rabbit should consume a heap of hay equal to or greater than its own body size every single day. Hay serves two vital, non-negotiable functions in rabbit health: digestive motility and dental wear.

1. Digestive Motility

The long indigestible fibers found in grass hay stimulate the muscular contractions of the stomach and intestines. This continuous movement keeps food moving smoothly through the gut and prevents hairballs from compacting. Unlike cats, rabbits cannot vomit. Any ingested fur from grooming must pass entirely through the gastrointestinal tract; continuous long-fiber hay consumption ensures fur moves freely without forming impactions.

2. Continuous Dental Wear

Rabbits have open-rooted, continuously growing teeth—incisors, premolars, and molars grow at a rate of 2 to 3 millimeters per week (over 4 inches per year). The side-to-side grinding motion required to chew tough, fibrous grass hay grinds down teeth naturally, keeping crowns and roots at a safe, healthy length. Without adequate hay chewing, rabbits develop sharp molar spurs that slice into the tongue and cheeks, leading to mouth abscesses, severe pain, and anorexia.

Choosing the Right Hay Types

Not all hays are created equal. The type of hay offered depends primarily on the rabbit's age and health status:

• Timothy Hay: The gold standard for adult rabbits (over 7 months old). It offers an ideal ratio of high crude fiber (28-34%), moderate protein (7-11%), and low calcium (0.4-0.6%). Timothy hay is available in 1st cut (coarsest, highest fiber, ideal for dental wear), 2nd cut (softer, leafy with seed heads, most popular), and 3rd cut (very soft and leafy, low fiber, ideal for picky eaters or underweight rabbits). Learn more about hay options in our dedicated rabbit nutrition hub.
• Orchard Grass Hay: Soft, fragrant, and high in fiber. An excellent alternative or addition to Timothy hay, especially for rabbit owners who have allergies to Timothy grass pollen.
• Meadow Hay: A natural blend of pasture grasses, herbs, and wild flora. Offers varied textures and aromas that encourage natural foraging behavior.
• Oat & Botanical Hays: Coarse hays containing oat husks or dried flower blossoms (marigold, chamomile). Excellent for rotational variety and enrichment.
• Alfalfa Hay: A legume hay (not a grass hay). High in protein, calories, and calcium. Alfalfa is strictly reserved for growing kits under 7 months old, pregnant or nursing does, or severely underweight senior rabbits under veterinary direction. Feeding Alfalfa to healthy adult rabbits causes kidney stones, bladder sludge, and severe obesity.

Component 2: Fresh Daily Leafy Greens (10–15% of Daily Diet)

Fresh vegetables supply essential hydration, micro-nutrients, minerals, and sensory enrichment. Adult rabbits should receive approximately 1 packed cup of fresh leafy greens per 2 pounds of body weight daily. Always wash greens thoroughly to remove residual pesticides, and introduce new greens gradually one variety at a time over 3 to 5 days to ensure digestive tolerance.

Safe Daily Low-Oxalate Greens

The majority of daily greens should consist of low-oxalate, low-calcium varieties. Rotate between 3 to 5 different varieties daily to provide balanced nutrition:

• Romaine Lettuce & Dark Leaf Lettuces: Red leaf, green leaf, butterhead, and Boston lettuce. (Never feed Iceberg lettuce—it contains lactucarium, a harmful sedative compound, and offers zero nutritional value).
• Herbs: Cilantro (coriander), parsley (curly and flat-leaf), basil, mint (peppermint, spearmint), dill, oregano, and rosemary.
• Cress & Endive: Watercress, Belgian endive, escarole, and radicchio.
• Bok Choy & Chinese Cabbage: Rich in vitamins, crisp texture.
• Dandelion Greens: Extremely palatable and nutrient-dense (pesticide-free).

High-Oxalate Greens (Feed In Rotation 1-2 Times Per Week)

Greens containing high levels of oxalic acid or calcium can contribute to kidney calcification or bladder sludge if fed daily in excessive amounts. Offer these varieties in small amounts once or twice per week:

• Spinach
• Swiss Chard
• Kale (Curly and Lacinato)
• Beet Tops
• Mustard Greens & Turnip Tops

Component 3: High-Fiber Commercial Pellets (5% of Daily Diet)

While pellets were historically considered the main staple of rabbit diets in livestock production, modern veterinary science emphasizes that pellets are merely a dietary supplement for companion rabbits. Pellets provide concentrated vitamins and trace minerals, but lack the long-strand physical fiber required for gut motility and dental wear.

An adult rabbit weighing 5 to 6 pounds requires only 1/8 to 1/4 cup of high-quality pellets per day. Overfeeding pellets leads directly to obesity, lazy chewing habits, refusal to eat hay, and chronic cecal dysbiosis.

How to Select High-Quality Pellets

When purchasing rabbit pellets, scrutinize the nutritional analysis label carefully:

• Choose Uniform Extruded Pellets Only: Always buy plain green pellets. Never purchase 'gourmet' mixes containing colorful bits, corn kernels, seeds, dried fruit, or cereal flakes. Rabbits will selectively pick out the sugary junk food bits, leading to severe nutritional deficiencies and intestinal blockages.
• Check Fiber Content: Minimum 20–25% crude fiber (higher is better).
• Check Protein Content: 12–14% crude protein for adult maintenance (16% for young growing kits).
• Check Fat & Calcium Content: Fat should be under 2%, and calcium should be between 0.5% and 0.9%.
• Base Ingredient: Timothy grass meal must be the first listed ingredient for adult rabbits (Alfalfa meal is acceptable only for growing kits under 7 months). Check out our full review of housing and care supplies in our rabbit housing guide.

Component 4: Healthy Treats in Strict Moderation

Rabbits have an intense sweet tooth and will eagerly consume sugary fruits and root vegetables. However, a rabbit's cecal microflora cannot process high concentrations of simple sugars and starches. Excessive fruit consumption causes rapid bacterial shifts, gas production, cecal dysbiosis, and GI stasis.

Treats must be limited to no more than 1 teaspoon to 1 tablespoon per 5 pounds of body weight per day. Treats should be used primarily as reward motivators for bonding, training, or health check verification.

Safe Fruit Treats (Fresh or Dried without Added Sugar)

• Apples (stem, leaves, and core completely removed; seeds contain trace cyanide)
• Blueberries, Strawberries, Raspberries, and Blackberries
• Bananas (peeled; feed sparingly as it is extremely high in sugar and sticky)
• Peaches, Nectaries, and Plums (pit completely removed)
• Melon (Watermelon, Cantaloupe, Honeydew—fruit flesh only)
• Pears (core and seeds removed)

Safe Vegetable Treats

• Carrots (tops are great greens; root flesh is high in sugar, feed small slices as treats)
• Bell Peppers (red, green, yellow; seeds and stem removed)
• Broccoli Florets & Stems (in small amounts; monitor for bloating)
• Squash & Zucchini slices

Component 5: Hydration & Water Requirements

Water is the silent fuel of the rabbit's digestive process. A healthy rabbit drinks as much water daily as a 15-pound dog (approximately 50 to 150 ml per kilogram of body weight daily). Water keeps intestinal contents moist and fluid, allowing smooth movement through the stomach and cecum.

Always provide fresh, clean water in a heavy ceramic bowl rather than a hanging plastic drip bottle. Studies show that rabbits drink significantly more water from open bowls because it matches their natural drinking posture. Water bottles frequently clog, freeze, or harbor bacteria inside the drinking valve. Clean water bowls daily with soap and fresh water.

Daily Rabbit Feeding Schedule & Portion Chart

Maintaining a consistent daily feeding schedule keeps your rabbit's biological clock stable and allows you to spot subtle changes in appetite immediately. Use the reference table below for adult rabbits (ages 1 to 6 years):

Life-Stage Feeding Adjustments

A rabbit's nutritional requirements change dramatically as it develops from a newborn kit into a geriatric senior. Adjusting diet parameters per age group prevents growth stunt in young rabbits and kidney dysfunction in seniors:

1. Baby Kits (0 to 7 Weeks)

Kits nurse exclusively on mother's milk once daily for the first 3 weeks. Around 3 to 4 weeks, kits begin nibbling mother's Alfalfa hay and pellets. Kits are fully weaned by 6 to 8 weeks.

2. Young Rabbits (7 Weeks to 7 Months)

Young growing rabbits require high protein and calcium to build bone density and muscle mass. Provide unlimited Alfalfa hay alongside unlimited Alfalfa-based pellets. Gradually introduce small amounts of fresh greens starting at 12 weeks of age, introducing one green at a time.

3. Young Adults (7 Months to 1 Year)

Transition period from growth to maintenance. Gradually mix Timothy hay with Alfalfa hay until Alfalfa is completely phased out by month 12. Decrease pellets from unlimited down to 1/2 cup per 6 lbs body weight. Increase fresh leafy greens daily.

4. Mature Adults (1 Year to 5 Years)

Strict adult maintenance diet: unlimited Timothy/grass hay, 1 cup greens per 2 lbs body weight, 1/8 to 1/4 cup Timothy pellets per 5 lbs body weight, and minimal treats.

5. Senior Rabbits (6+ Years)

Senior rabbits often lose weight due to arthritis, dental wear, or reduced kidney efficiency. Maintain adult Timothy hay diet, but if weight loss occurs, increase pellet portion slightly or reintroduce small amounts of high-protein Alfalfa hay under veterinary direction. Keep track of aging signs in our rabbit health education section.

Deadly Foods: What Rabbits Can NEVER Eat

Rabbits lack the ability to vomit, meaning any toxic substance ingested enters the bloodstream or digestive tract directly. The following foods are strictly toxic or dangerous to rabbits and must be kept out of reach at all times:

• Chocolate & Caffeine: Contains theobromine and caffeine, causing fatal cardiac arrhythmia, tremors, and seizures.
• Allium Family (Onions, Garlic, Shallots, Chives, Leeks): Causes severe hemolytic anemia and destruction of red blood cells.
• Avocados: Contains persin, a toxic fatty acid derivative causing respiratory distress, cardiac failure, and sudden death.
• Rhubarb: All parts of the rhubarb plant contain toxic oxalic acid crystals, causing acute renal failure.
• Fruit Seeds & Pits: Apple seeds, peach pits, plum pits, and cherry pits contain cyanogenic glycosides (cyanide poisoning).
• Human Snacks & Baked Goods: Bread, pasta, crackers, cookies, chips, and cereals contain high starch and gluten, triggering lethal enterotoxemia.
• Yogurt Drops & Dairy Products: Adult rabbits are lactose intolerant. Dairy destroys cecal bacterial balance and causes severe gut necrosis.
• Nuts, Seeds & Grains: High fat and hard to digest, causing digestive impactions and liver lipidosis.
• Iceberg Lettuce: Contains chemical compound lactucarium and excess water, leading to severe runny diarrhea.
• Toxic Houseplants: Lilies, philodendrons, dieffenbachia, poinsettias, azaleas, ivy, and nightshades (tomatoes, potatoes, eggplants foliage).

Recognizing Digestive Emergencies: GI Stasis

Because diet directly dictates gut health, feeding errors often manifest as Gastrointestinal (GI) Stasis. GI Stasis is a silent, life-threatening condition in which the stomach and intestines slow down or stop moving entirely. Trapped gas expands the intestines, causing unbearable pain, hypothermia, shock, and organ failure within 24 to 48 hours.

Warning Signs of GI Stasis:

• Refusal to eat hay or pellets for more than 6 to 12 hours
• Absence of fecal pellets or producing small, misshapen, hard pellets
• Lethargy, hunched posture, and grinding teeth loudly in pain (bruxism)
• Cold ears and abnormally low body temperature (below 100°F / 37.7°C)
• Loud gurgling gut sounds or complete absence of abdominal sounds

If your rabbit exhibits any of these symptoms, treat it as a critical medical emergency. Seek immediate care from an experienced exotics veterinarian. Never attempt to force-feed a rabbit that may have an intestinal obstruction.

Sources & Further Reading

• House Rabbit Society: Rabbit Nutrition & Feeding Guidelines
• Rabbit Welfare Association & Fund (RWAF): A Healthy Diet for House Rabbits
• Merck Veterinary Manual: Management and Nutrition of Rabbits
• VCA Animal Hospitals: Feeding Guide for Domestic Rabbits