Introduction
Rodent pets, including hamsters, guinea pigs, rabbits, rats, and mice, have diverse nutritional requirements. Feeding them appropriately is crucial for their health and longevity. This guide explores the specific dietary needs of common rodent species, highlighting differences in recommended food types, portion sizes, and essential nutrients.
Recommended Diet Types
Hamsters
Hamsters thrive on a pelleted diet formulated for hamsters, supplemented with fresh vegetables (e.g., carrots, broccoli) and occasional fruits. Avoid sugary treats. Timothy hay is not necessary but can be offered for fiber.
Guinea Pigs
Guinea pigs require a diet high in vitamin C, as they cannot synthesize it. Feed unlimited grass hay (timothy or orchard grass), pellets fortified with vitamin C, and daily fresh vegetables (bell peppers, leafy greens). Avoid fruits high in sugar.
Rabbits
Rabbits need unlimited grass hay (timothy, meadow), fresh vegetables (leafy greens), and a limited amount of high-fiber pellets. Fruits should be given sparingly. Avoid muesli mixes with seeds and grains.
Rats
Rats are omnivores and need a balanced diet of high-quality lab blocks, fresh fruits, vegetables, and occasional lean protein (cooked egg, chicken). Avoid processed foods and sugary treats.
Mice
Mice require pelleted diets (lab blocks) supplemented with small amounts of fresh vegetables and fruits. Provide whole grains like cooked rice or oats. Avoid fatty seeds (sunflower) in excess.
Portion Sizes and Daily Calorie Needs by Age, Size, and Activity
| Species | Weight (grams) | Daily Calories | Pellet Amount | Vegetables |
|---|---|---|---|---|
| Hamster (Syrian) | 100-200 | 15-25 | 1-2 tbsp | 1-2 tsp |
| Guinea Pig | 700-1200 | 60-80 | 1/8-1/4 cup | 1 cup |
| Rabbit (dwarf) | 1000-2000 | 100-150 | 1/4-1/2 cup | 2 cups |
| Rat | 250-500 | 40-60 | 10-15 g | 1-2 tbsp |
| Mouse | 20-50 | 10-15 | 1 tsp | 1-2 tsp |
Adjust portions based on activity level: less for sedentary, more for active young or pregnant/nursing animals.
Feeding Frequency and Schedule
- Hamsters: Feed once daily, preferably in the evening when they are active.
- Guinea Pigs: Provide fresh hay and water constantly; pellets twice daily; vegetables once daily.
- Rabbits: Unlimited hay; pellets twice daily; vegetables once or twice daily.
- Rats: Lab blocks available at all times; fresh foods once daily.
- Mice: Provide pellets ad libitum; fresh foods in small amounts daily.
Essential Nutrients
All rodents need protein, fat, carbohydrates, vitamins, and minerals. However, proportions vary:
- Protein: Rabbits and guinea pigs require lower protein (12-16%) than rats and hamsters (16-20%).
- Fiber: High fiber (18-25%) is crucial for rabbits and guinea pigs to prevent GI stasis. Hamsters need moderate fiber (8-12%).
- Vitamin C: Essential for guinea pigs (25-50 mg daily).
- Calcium: Rabbits and guinea pigs need adequate calcium for teeth and bones, but excess can cause sludgy urine.
Toxic or Harmful Foods
Common toxic foods for rodents include:
- Chocolate, caffeine, alcohol
- Onions, garlic, chives
- Raw beans, potatoes
- Avocado (skin and pit)
- Rhubarb
- Citrus fruits (for guinea pigs, they are high in sugar and can cause mouth sores)
- Dairy products (except small amounts of plain yogurt for rats)
Water Intake Recommendations
Fresh, clean water must be available at all times. Use water bottles with sipper tubes to prevent contamination. Daily water intake varies: hamsters ~10-20 ml; guinea pigs ~100-150 ml; rabbits ~300-400 ml; rats ~30-50 ml; mice ~5-10 ml. Increase during hot weather or illness.
Beneficial Supplements
- Vitamin C: For guinea pigs, offer liquid vitamin C supplement added to water or vegetables.
- Probiotics: Useful after antibiotic treatment or diarrhea; choose rodent-specific products.
- Hay-based treats: Encourage foraging and dental health.
- Oxbow Digestive Support: For rabbits and guinea pigs with GI issues.
Feeding Differences for Young, Adult, and Senior Rodents
- Young (up to 6 months): Higher protein and calcium for growth. Alfalfa hay for rabbits and guinea pigs; higher-fat pellets for hamsters and rats.
- Adults (6 months - 2/3 years): Maintenance diet with moderate protein and fiber. Avoid overfeeding treats.
- Seniors (2+ years): Lower calorie intake to prevent obesity. Softer foods for dental issues. Continued vitamin C for guinea pigs.
Signs of Healthy vs. Unhealthy Diet
Healthy signs: Bright eyes, clean fur, firm droppings, normal activity, proper weight, and good dental condition.
Unhealthy signs: Diarrhea or soft feces, overgrown teeth, weight loss or gain, lethargy, dull coat, and reduced appetite. Immediate veterinary attention if symptoms persist.