Nutrition directly determines Dutch Guinea Pig health, with requirements differing substantially from other small pets. The critical dietary factor unique to guinea pigs is their inability to synthesize vitamin C internally—a trait shared with humans but not most other mammals. Guinea pigs must obtain vitamin C daily through their diet; this is not optional but essential for survival. Scurvy develops within 2-3 weeks without adequate vitamin C intake.
Timothy hay forms the dietary foundation for Dutch Guinea Pigs, comprising approximately 80% of total food intake. Hay must be available in unlimited quantities at all times, as continuous grazing supports proper digestive function and provides essential fiber. The abrasive texture also wears down continuously growing teeth, preventing painful dental malocclusion. Young pigs under six months and pregnant or nursing sows benefit from alfalfa hay, transitioning to timothy as adults to prevent calcium excess.
Commercial guinea pig pellets supplement the hay-based diet with concentrated nutrition. Select plain timothy-based pellets without seeds, nuts, dried fruit, or colored pieces that encourage selective eating and nutritional imbalance. Although pellets often contain added vitamin C, this nutrient degrades rapidly after manufacture and cannot be relied upon as the sole vitamin C source. Feed approximately 1/8 cup of pellets daily per adult pig.
Fresh vegetables deliver essential vitamin C while providing dietary variety and enrichment. Bell peppers rank as the premier vitamin C source, with red and yellow varieties containing 100-200mg per pepper. Other excellent options include romaine lettuce, cilantro, parsley, kale, and small amounts of carrot or cucumber. Introduce new vegetables gradually over several days to prevent digestive upset. Dangerous foods to avoid include potatoes, onions, garlic, and anything from the nightshade family.
Daily vitamin C requirements depend on life stage: 10-20mg for healthy adults, 30-50mg for pregnant or nursing sows, 20-30mg for growing young pigs, and up to 50mg for sick or stressed individuals. Human children's chewable vitamin C tablets or guinea pig-specific supplements provide reliable supplementation. Do not add vitamin C to water bottles, as it degrades within hours, tastes unpleasant, and may reduce water consumption.
Clean, fresh water must be continuously available. Most owners provide water through sipper bottles that keep water clean, though heavy ceramic bowls work if changed frequently. Check water supply daily and clean bottles weekly to prevent algae and bacterial buildup. Average water consumption is approximately 100ml daily, though this varies with temperature, activity, and vegetable intake.