Critical Care for guinea pigs is produced by Oxbow. It’s also a term used more broadly to refer to recovery foods, which are fed when guinea pigs are unwell and need more food moving through their gut. They’re also used to keep piggies from losing weight when they’re old or recovering from surgery or illness.
In this article, I’ll discuss everything there is to know about Critical Care, from what it is to how and when to feed it to your guinea pig.
What is Critical Care for Guinea Pigs?
Critical Care is an essential part of any guinea pig emergency kit. It’s a recovery food that can be syringe-fed to piggies who aren’t eating or who need more calories in their diet.
Critical Care is made by Oxbow, which is a vet-trusted brand for guinea pigs and other small pets. There are also other brands that make recovery foods, and you can make your own by mixing guinea pig pellets and warm water.
Why Critical Care Belongs in Your Emergency Kit
Guinea pigs can stop eating at any time. It’s a common symptom for piggies with dental issues, bloat, upper respiratory infections (URIs), and more.
The problem with this is that guinea pigs cannot go long without food–just 6-8 hours can put them into deadly gastrointestinal (GI) stasis. This is why Critical Care, or an alternative recovery food, should be in your guinea pig emergency kit at all times.
You don’t want to be struggling to find Critical Care in stores or waiting for it to ship when you really need it.
I also recommend keeping a couple of flavors for picky piggies. Some will dislike a specific flavor. Others may eat one flavor for a while, and then stop taking it as well. Switching to a new flavor can sometimes help in these cases.
How Do I Know if My Guinea Pig Needs Critical Care?

Weighing your guinea pigs weekly is one of the most important things you can do to monitor their health. If your guinea pig loses more than 100 grams, please make an appointment with your veterinarian as soon as possible.
In the meantime, it’s a good idea to feed critical care to ensure that they’re getting the nutrients they need and to hopefully prevent more weight loss.
Here are some reasons you might need to feed your guinea pig Critical Care:
- Sick guinea pigs who have stopped eating typically benefit from Critical Care to keep their guts moving and their weight up until you can get them to the vet. (Please look for a same-day appointment if at all possible, as refusing to eat is an emergency!)
- Sick guinea pigs who are eating less than usual can also benefit as Critical Care can help keep their weight up as they recover.
- Guinea pigs recovering from surgery can sometimes be less motivated to eat, and Critical Care can help them get the calories they need. If your piggy is acting differently after surgery, remember to talk to your vet about what you see!
- Senior guinea pigs who have lost weight may need more calories to keep their weight up, which Critical Care can help with.
- Anytime it’s recommended by your veterinarian. It’s important to consult with your veterinarian about feeding Critical Care, as you don’t want to be feeding too much of it or to a piggy who doesn’t need it. If you’re uncertain, it’s always best to make an appointment to discuss your concerns.
Please remember that while Critical Care can be lifesaving, it’s typically not the only treatment your guinea pig will need. It’s best used while waiting to see a vet or under their instructions, not as a replacement for veterinary care.
How to Use Critical Care
Use Critical Care and other recovery foods as recommended by your veterinarian or on the product label. Always follow your veterinarian’s instructions first, as they may vary from the written instructions on the product.
If you’ve forgotten what your vet recommended, please call and ask for confirmation. I’ve had to do this before since appointments with sick pets can be overwhelming, and in my experience, your vet truly doesn’t expect you to retain all of the information they give you the first time around.
How Much Critical Care to Feed a Guinea Pig
Oxbow’s Critical Care recommends feeding three tablespoons per kilogram of body weight, which is equal to 2.2 pounds or 1000 grams. Remember that this measurement is for the dry product, not the slurry after it’s been mixed with water.
This is also a daily measurement, but Oxbow recommends dividing it into 4-6 feedings a day. So, you might feed half a tablespoon of Critical Care six times a day to your 1000-gram guinea pig.
How to Prepare Critical Care
Only prepare one portion of critical care at a time, not the full daily amount. This is because you’ll need to throw away leftovers after each serving.
Once you’ve measured out the dry mixture into a small bowl, add two parts water to one part Critical Care and mix. For instance, when feeding one tablespoon of Critical Care, add two tablespoons of water. You can adjust the water if needed to get the right consistency.
Then, fill your 1 ml syringe with the mixture and feed it to your guinea pig. Repeat as needed until the serving is gone. (Remember to break their daily amount into multiple servings!)
How to Syringe Feed a Guinea Pig
After reading the above, you might be thinking: yes, but how do I syringe feed my guinea pig? Some piggies will latch onto the syringe with ease, but others need more coaxing.
Feeding your guinea pig can be particularly challenging when they are feeling unwell and unwilling to eat.
If your piggy is refusing to eat, you can try dipping the end of the syringe in something they love, such as piggy-safe baby food or their vitamin C supplement.
If your initial attempts fail, gently hold your guinea pig and wrap them in a towel on your lap to prevent them from backing away while you feed them with the syringe.
Make sure to feed your guinea pig in an upright position with their feet touching a stable surface. Angle the syringe behind their incisors and release small amounts of Critical Care at a time, allowing them to swallow before continuing.
Start with 0.05 ml and increase to 0.2 ml if your guinea pig tolerates it well. If the mixture thickens, add water to maintain a suitable consistency.
Be cautious not to feed too quickly to prevent inhalation instead of swallowing. Remember that your guinea pig must voluntarily swallow the food for it to be effective. Stop feeding if they show signs of distress.
If your guinea pig refuses to eat Critical Care, contact your vet immediately as it may indicate a serious health issue.
Weighing Your Guinea Pig After Feedings
During Critical Care feedings, regular weighing is crucial, especially if your guinea pig is unwell. Daily weigh-ins can help monitor their weight and adjust feeding accordingly.
If your guinea pig is not gaining weight as desired, consult your vet for guidance on feeding frequency and other treatment options.
Do not exceed the recommended dosage of Critical Care without consulting your vet to avoid potential health risks.
Critical Care Alternatives
While Critical Care is a popular brand, there are other options available, such as EmerAid, Sherwood, or Science Selective RecoveryPlus.
Some guinea pigs may prefer the taste of alternative products, so it’s worth exploring different options if they reject Critical Care.
In emergencies, you can create a homemade recovery food by mixing warm water with your guinea pigs’ pellets to a pureed consistency.
Having a supply of recovery food on hand is essential for unexpected health issues, as they can occur at any time.
Being prepared and familiar with feeding methods like Critical Care can be beneficial during emergencies, ensuring you can provide immediate care to your guinea pig.
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