Understanding Rabbit Nutrition Basics
Rabbits are herbivores with a highly specialized digestive system designed for continuous fiber intake. Unlike dogs and cats, rabbits require constant access to food — their gut must keep moving at all times to prevent potentially fatal gastrointestinal stasis (GI stasis), a condition where gut motility slows or stops. Getting the diet right is one of the most important aspects of rabbit care and has a profound impact on lifespan and quality of life.
The ideal rabbit diet closely mimics what rabbits would eat in the wild: primarily fibrous plant material with small amounts of nutrient-dense foods. The foundational rule of rabbit nutrition is simple: 80% hay, 15% fresh leafy greens, and 5% pellets. This proportion may seem hay-heavy, but it reflects the critical importance of long-strand fiber in maintaining gut health and dental wear.
Hay: The Most Important Part of the Rabbit Diet
Unlimited, fresh timothy hay (or other grass hays — orchard grass, meadow hay, oat hay) should be available 24 hours a day, 7 days a week. Hay provides the long-strand fiber that is essential for normal gut motility, wearing down continuously growing molars, maintaining healthy cecotrope production, and preventing obesity.
Adult rabbits should eat hay equivalent to their own body size each day. Good hay smells fresh, is slightly green, and is free of mold, excessive dust, or musty odors. Avoid storing hay in humid conditions or in sealed plastic bags — it needs airflow.
Alfalfa hay is appropriate for baby rabbits under 6 months of age due to its higher calcium and protein content supporting growth, but should be phased out after 6 months — the high calcium content can cause bladder sludge and stones in adult rabbits. Adult rabbits should eat grass hays only.
Fresh Vegetables and Leafy Greens
Fresh leafy greens should be offered daily — approximately 1 cup per 2 pounds (0.9 kg) of body weight. A varied selection of greens is ideal. Excellent choices include:
- Romaine lettuce (not iceberg — too high in water and low in nutrients)
- Kale (in moderation — high in oxalic acid)
- Bok choy
- Cilantro / coriander
- Flat-leaf parsley (small amounts — high in calcium)
- Dandelion greens (excellent — highly nutritious)
- Arugula / rocket
- Basil and dill
- Fennel tops
Introduce new vegetables gradually, one at a time, to prevent digestive upset. Watch for soft cecotropes or diarrhea after introducing a new food — if these occur, discontinue that food and try again in a few weeks.
Vegetables to limit or avoid: Iceberg lettuce, spinach (occasional only — high in oxalates), mustard greens (occasional), and any cruciferous vegetables like cabbage, broccoli, or cauliflower in large amounts (can cause gas).
Pellets: How Much and Which Kind
Pellets are a convenient way to provide concentrated nutrition but should be a minor part of the diet — not the foundation, as they often are in traditional rabbit care. For an adult rabbit, offer no more than 1/4 cup of high-quality pellets per 5 pounds (2.25 kg) of body weight per day.
Choose plain, uniform timothy-based pellets with no added seeds, nuts, dried fruit, or colored pieces (these are sugar and fat-laden filler ingredients). Look for pellets with at least 18% fiber, no more than 14% protein, and minimal added sugars. Alfalfa-based pellets are appropriate for rabbits under 6 months; timothy-based pellets for adults.
Overfeeding pellets is a leading cause of obesity, dental disease, and GI problems in pet rabbits. If your rabbit is leaving hay in favor of pellets, reduce the pellet portion.
Foods to Avoid and Toxic Plants
Many foods that seem innocuous are harmful or even toxic to rabbits:
- Sugary fruits — Rabbits naturally love fruit, but the high sugar content can disrupt gut bacteria and cause obesity. Offer fruit only as an occasional treat (1–2 tablespoons maximum, 2–3 times weekly).
- Starchy vegetables — Potatoes, corn, peas, and beans are high in starch and inappropriate for rabbits.
- Avocado — Toxic to rabbits; can cause respiratory distress and death.
- Onions and garlic — Toxic; can cause blood abnormalities.
- Rhubarb — Toxic due to high oxalic acid.
- Chocolate — Toxic, as in most animals.
- Iceberg lettuce — Contains lactucarium, a chemical that can cause digestive problems in large amounts.
- Muesli-style rabbit mixes — Commercial muesli mixes with seeds, puffed cereals, and dried fruit are nutritionally inappropriate and encourage selective feeding.
Fresh water must always be available. Heavy ceramic bowls or sipper bottles both work — offer both and see which your rabbit prefers. Bowls require more frequent cleaning to prevent algae buildup.