Rabbits possess one of the most complex and sensitive digestive systems in the animal kingdom. Their health is inextricably linked to a high-fiber, low-sugar diet that facilitates continuous gut motility. In 2026, veterinary standards emphasize the "85% Hay Rule" as the primary defense against life-threatening conditions like GI stasis. This authority guide provides a science-backed framework for feeding your rabbit throughout every life stage.
1. The Foundation: Unlimited Grass Hay
Hay is not just food; it is a mechanical tool for dental wear and a source of the long-strand fiber required for digestion. Without it, a rabbit's teeth will overgrow, and their gut will slow down, leading to an emergency health situation.
- Timothy Hay (1st or 2nd Cut): The gold standard for adult rabbits due to its ideal fiber-to-calcium ratio.
- Orchard Grass & Meadow Hay: Excellent alternatives for owners with allergies or to provide variety and encourage foraging.
- Oat Hay: High in fiber and great for dental wear, though it contains more seed heads (sugar) and should be rotated.
- Alfalfa Hay: Highly caloric and rich in calcium; strictly for kits (under 6 months) or nursing mothers. Feeding this to adults causes bladder stones.
💡 The Biological Mystery: Cecotropes
You may notice your rabbit eating small, soft, shiny droppings. These are cecotropes (night feces), and they are vital for survival. They contain essential B vitamins and proteins produced by bacteria in the cecum. If a rabbit stops eating these, it is often a sign of dental pain or obesity, and you should consult a vet.
2. Fresh Greens: The Daily Salad
Vitamins and hydration are primarily derived from a daily selection of fresh, leafy greens. Aim for 1-2 packed cups of greens per 2 lbs of body weight daily.
| Daily Staples (Low Oxalate) | Occasional (High Oxalate) |
|---|---|
| Romaine Lettuce, Cilantro, Parsley | Spinach, Swiss Chard |
| Basil, Dill, Mint, Bok Choy | Beet Greens, Mustard Greens |
| Dandelion Greens, Raspberry Leaves | Kale, Broccoli (can cause gas) |
🚫 Critical Toxicity Watch
Rabbits cannot vomit; if they ingest a toxin, it must pass through their entire system. Avoid these common hazards:
- Iceberg Lettuce: Contains lactucarium, which can be harmful, and offers zero nutrition.
- Avocado: Highly toxic to lagomorphs; causes heart failure.
- Onions & Garlic: Causes hemolytic anemia (blood cell destruction).
- Fruit Seeds & Pits: Most contain trace amounts of cyanide.
3. Pellets: The Fortified Supplement
Pellets should be viewed as a concentrated supplement. Overfeeding pellets is the leading cause of obesity and "poopy butt" (uneaten cecotropes) in pet rabbits.
- Purity is Key: Only feed plain, Timothy-based pellets. Avoid "muesli" mixes with seeds or corn.
- Portion Control: Most adult rabbits only require 1/8 to 1/4 cup per day. If your rabbit is overweight, hay should be the focus.
🚨 Red Alert: GI Stasis
If your rabbit stops eating or producing droppings for more than 12 hours, they are likely in Gastrointestinal (GI) Stasis. This is a silent killer. Signs include: Hunching in a corner, tooth grinding (loud), and refusing their favorite treat. This is a medical emergency—see an exotic vet immediately.
4. Hydration and Water Quality
A rabbit's water intake is significantly higher when provided in a heavy ceramic bowl rather than a drip-bottle. It allows for a more natural drinking position and ensures they stay hydrated, which is critical for preventing "sludge" (calcium buildup) in their urinary tract.
🥗 Rabbit Food Safety & Toxicity Checker
Unsure if a specific human food, fruit, or vegetable is safe for your rabbit? Browse our detailed, veterinary-reviewed safety guides below to see complete portion limits and potential toxicities:
💡 Tip: Always introduce new foods slowly, starting with a portion the size of a postage stamp, and check for signs of soft stool.
Conclusion: Feeding for Longevity
A consistent, high-fiber diet is the single most important factor in extending your rabbit's lifespan. By prioritizing hay and fresh greens over treats and pellets, you are ensuring their complex digestive system remains stable. For more on building a safe space for your bunny, explore our habitat guide. If you notice any changes in appetite, consult our emergency health checker immediately.