
Calcium is an essential mineral in a guinea pig's diet, but it must be consumed in moderation. Excess calcium can lead to bladder stones, while a deficiency can cause weak bones and teeth. To reduce calcium in a guinea pig's diet, it is recommended to use good quality hay, such as Timothy, Orchard, or Bermuda hay, which has a lower calcium content. Fresh and purified water is also preferable to mineral or seawater, as these contain high amounts of calcium. Additionally, it is important to control portion sizes and maintain a balanced diet with other essential vitamins and nutrients, such as phosphorus and vitamin C.
How to reduce calcium in a guinea pig's diet
| Characteristics | Values |
|---|---|
| Hay | Use good quality hay, Timothy, Orchard, or Bermuda hay that is lower in calcium. Hay should make up 80% of a healthy guinea pig's diet. |
| Water | Use filtered water instead of tap water. Mineral water and seawater are not suitable as they contain high amounts of calcium. |
| Vegetables | Feed low-calcium vegetables such as bell peppers, cucumber, celery, French beans, coriander/cilantro, and spring greens. |
| Portion size | Control the portion size of food to reduce overall calcium intake. |
| Pellets | Only use low or no-calcium pellets. |
| Calcium ratio | Aim for a calcium to phosphorus ratio of around 1.33. |
| Calcium deficiency | Be aware that a sudden reduction in calcium can lead to calcium being drawn from the bones, causing bladder sludge and stones. |
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What You'll Learn

Avoid high-calcium vegetables
While calcium is an essential mineral in a guinea pig's diet, an overload of it can be harmful to their health. Bladder stones, also known as uroliths or urinary tract stones, can develop anywhere in the urinary tract, bladder, or kidneys. These stones can cause a range of issues, from being passed painlessly with urination to causing bladder irritation, bleeding, or even preventing urination altogether.
To reduce the risk of bladder stones, it is important to avoid feeding your guinea pig high-calcium vegetables. Dark, leafy greens, such as spinach, kale, and collard greens, are known to be high in calcium. Other vegetables that are rich in calcium include broccoli, Brussels sprouts, and cauliflower. By limiting the amount of these vegetables in your guinea pig's diet, you can help maintain a healthy calcium intake.
It is worth noting that completely removing calcium from your guinea pig's diet is not advisable. A lack of calcium can lead to weak bones and teeth, and in severe cases, hind leg paralysis. The key is to achieve a balanced diet with the proper ratio of calcium to phosphorus. Guinea pig pellets based on Timothy hay are recommended, as they provide a suitable calcium-to-phosphorus ratio.
Additionally, you can monitor your guinea pig's calcium intake by observing their fleece liners. White spots on the liners can indicate that your guinea pig has consumed a large amount of calcium. These spots are a natural way for your guinea pig to pass excess calcium through their urine. Consulting with a qualified vet is also recommended to ensure your guinea pig's calcium and phosphorus levels are within the healthy range.
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Opt for Timothy, Orchard, or Bermuda hay
While calcium is an essential mineral in your guinea pig's diet, too much or too little calcium can be harmful to their health. A calcium-deficient diet can lead to weak bones and teeth, and even cause hind leg paralysis. On the other hand, an overload of calcium can lead to bladder stones.
To ensure your guinea pig gets the right amount of calcium, you can opt for Timothy, Orchard, or Bermuda hay. Timothy hay is the number one choice for guinea pigs as it is safe and provides several health benefits. It has a high fibre content, which promotes a healthy digestive system and results in firmer and healthier waste. It also helps maintain the right balance of calcium and protein in your guinea pig's diet, reducing the chances of bladder stone formation. Additionally, the crunchiness of Timothy hay promotes dental health by helping to prevent overgrown or misaligned teeth, a common issue in guinea pigs.
Orchard hay is a good alternative if your guinea pig has allergies to Timothy hay. It is softer, sweeter, and has a pleasant fragrance that can entice picky eaters. Orchard hay also has high fibre content, which is beneficial for digestive health, but it has slightly lower protein content than Timothy hay.
Bermuda hay is another option for guinea pig owners. While there is limited information specific to Bermuda hay for guinea pigs, it is a type of grass hay that can provide the right balance of calcium and phosphorus. Grass hays have a calcium to phosphorus ratio of around 1.5:1, which is much closer to the ideal ratio of 1.33 than legumes, which have a ratio of greater than 4:1.
By choosing Timothy, Orchard, or Bermuda hay, you can help ensure your guinea pig receives the appropriate amount of calcium and maintain their overall health and well-being.
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Provide filtered water
While calcium is an essential mineral in a guinea pig's diet, an overload of it can be harmful to their health. On the other hand, a lack of calcium in their diet can also be detrimental. It is important to carefully monitor how much calcium is present in the foods they are eating and to portion out and plan accordingly.
One way to reduce calcium in your guinea pig's diet is to provide filtered water instead of tap water. Filtered water contains smaller amounts of calcium than tap water. You can either purchase filtered water at grocery stores or buy a filter and use it at home. Mineral waters and sea waters are not good for guinea pigs because they contain high amounts of calcium.
It is important to provide your guinea pig with constant access to fresh water. Water is an essential part of a healthy guinea pig diet. About 80% of a healthy guinea pig's diet should consist of quality hays, with the remaining 10% being fresh produce.
The ideal ratio of calcium to phosphorus in a guinea pig's diet is around 1.33:1. Phosphorus is important for the absorption of calcium, so it is crucial to monitor both of these minerals in your guinea pig's diet. A healthy guinea pig's calcium level should be between 2-3 mmol/L of blood, and their phosphorus level should be in the range of 0.68-2.3 mmol/L per litre of blood.
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Control portion sizes
While it is important to include calcium in a guinea pig's diet, too much calcium can be harmful to their health. Therefore, it is important to control the portion sizes of what you feed them.
Younger guinea pigs have higher calcium requirements as they need it for their rapidly growing bodies to strengthen their bones and teeth. The average guinea pig needs around 8 g of calcium per kg of food. This doesn’t mean you should feed it to them all at once! Try to distribute their calcium intake through their meals so they don’t overconsume the mineral.
Portion sizes are important because too much calcium can have negative effects on your guinea pig’s health, and it can become dangerous very quickly. Calcium secretions in guinea pig urine can be normal, but excessive amounts of the deposits are signs that something is wrong. You should be concerned and consult your veterinarian when you notice there are harder, granular calcium deposits in their urine. These will look like grains of sand, and the bigger the granules are, the more concerning it is, and it can be painful for your guinea pigs to pass these.
Excess hay, high-calcium veggies, and untreated tap water can also contribute to excess calcium in your guinea pig's diet. Therefore, it is important to be mindful of the types of food you are feeding your guinea pig and their portion sizes.
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Monitor calcium intake
It is important to monitor your guinea pig's calcium intake to ensure they are getting the right amount. While calcium is an essential mineral in their diet, too much or too little can be harmful.
Calcium is vital for strengthening bones and teeth, and a deficiency can lead to weak bones and teeth. However, too much calcium can lead to bladder stones, sludge issues, and even kidney problems.
To monitor your guinea pig's calcium intake, you should be aware of the calcium content in the food they are eating. The ideal ratio of calcium to phosphorus in a guinea pig's diet is around 1.33. You can calculate this ratio by dividing the calcium amount by the phosphorus level in the food. For example, if a food contains 40 grams of calcium and 17 grams of phosphorus, the Ca:P ratio is around 0.5:1 (40 divided by 17).
To reduce the risk of bladder stones and other health issues, you can lower your guinea pig's calcium intake by using good quality hay with low calcium content, such as Timothy, Orchard, or Bermuda hay. About 80% of a healthy guinea pig's diet should consist of quality hays. You should also provide low-calcium vegetables and fresh, filtered water instead of tap water.
It is important to note that the calcium requirements may vary for younger guinea pigs, pregnant guinea pigs, and nursing mothers. Consult with a qualified veterinarian to determine the appropriate calcium intake for your guinea pig's specific needs and to get their calcium and phosphorus levels tested.
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Frequently asked questions
Excess calcium in a guinea pig's diet can lead to stone formation and sludge issues. This can cause bladder stones, which can get stuck in the urethra, and lead to other issues like hematuria, stranguria, dysuria, and metastatic calcification.
White spots in your guinea pig's urine indicate that it is passing out excess calcium. You may also notice harder, granular calcium deposits in their urine, which can be painful for them to pass.
Alfalfa and clover hay are high in calcium and should be avoided. Vegetables like legumes, carrots, cucumber, sweet potato, and romaine lettuce are also high in calcium.
Stick to Timothy, Orchard, or Bermuda hay, which are lower in calcium. 80% of a healthy guinea pig's diet should consist of quality hays. Feed more low-calcium vegetables like cilantro, chard, kale, celery, and okra.











































