The adult Rhinelander Rabbit has completed its major growth phase and now requires a maintenance diet carefully calibrated to sustain its lean, athletic frame without encouraging the weight gain that can compromise the breed's hallmark full-arch body type. Unlimited grass hay remains the absolute cornerstone of the diet, ideally timothy hay, though orchard grass, meadow hay, or a blend of these varieties provides equally beneficial long-strand fiber. Hay should constitute approximately 80 percent of the adult Rhinelander's daily food intake by volume, supporting continuous dental wear, healthy cecal fermentation, and proper gastrointestinal motility.
Pellets transition from a growth supplement to a measured maintenance ration during adulthood. For a Rhinelander weighing between six and a half and ten pounds, a daily pellet allowance of approximately one-quarter cup per five pounds of body weight is appropriate. Choose a high-fiber, plain pellet with a minimum of 18 percent crude fiber and no added sugars, seeds, or dried fruit. Overfeeding pellets is one of the most common dietary mistakes with adult rabbits and is particularly detrimental in an arch breed where excess weight compresses the spine's natural curvature and strains the slender limbs.
A daily serving of fresh leafy greens provides essential vitamins, minerals, and hydration. Offer a rotating variety of at least three types of greens each day, drawn from a safe list that includes romaine lettuce, cilantro, parsley, basil, endive, bok choy, and dandelion greens. The daily volume should approximate one packed cup per two pounds of body weight. Introduce any new green individually and in small amounts, watching for digestive upset over two to three days before incorporating it into the regular rotation. High-oxalate greens like spinach and beet tops should appear only occasionally rather than as daily staples.
Fresh water must be available continuously. A heavy ceramic crock, cleaned and refilled daily, is the most effective delivery method for an active breed like the Rhinelander. The crock should be positioned at a height that allows the rabbit to drink comfortably without straining. Monitor daily water consumption as a baseline health indicator. A sudden increase in drinking may signal kidney disease or diabetes, while a decrease can precede dehydration and gastrointestinal stasis. Adult Rhinelanders typically consume between four and eight ounces of water per day depending on their diet's moisture content and the ambient temperature.