Can Guinea Pigs Eat Oak Leaves?

What Do You Do When Your Guinea Pigs Eat Oak Leaves

As a pet owner, you should know what your pet can safely eat or not because you would not want to give toxic materials to them. Guinea pigs are unique kinds of animals. You cannot just feed them with just about anything because some foods you think are okay for other animals may be poisonous to them.

Again, guinea pigs are quite choosey about what they eat. They will most likely reject any unfamiliar food and stay hungry, and starving would stress them a lot. Guinea pigs are mainly herbivores, possessing molar teeth that can appropriately grind plant matter like leaves and grasses.

But can guinea pigs eat oak leaves? Well, it’s not advisable to feed your cavies with oak leaves due to its poisonous nature. We’ll find out more about oak leaves below.

What are Oak Leaves?

Oak leaves come from the ancient oak tree. There are many oak varieties in the United States, over 40 of them. There is at least one particular variety in every state. The oak trees are considered everlasting because of how long they live.

Can Guinea Pigs Eat Oak Leaves?

Can Guinea Pigs Eat Oak Leaves

We highly suggest you don’t give your guinea pigs oak leaves to eat. While some people argue that a small number of oak leaves do not harm guinea pigs, we politely disagree with that because oak leaves are poisonous in whatever quantity. Not just to guinea pigs but other livestock like cattle, sheep, goat, and even rabbits.

Oak leaves from short oak trees are the most toxic, and Quercus havardii is the deadliest oak species. It is not safe for livestock to consume them.

Mascal, an academic, first noted the toxicity of oaks to livestock in the year 1662. Livestock farmers did not know how deadly the oaks were then. Cornevin stated it again in his publication in the year 1893.

Many of these claims were suspicions and not backed by scientific evidence in those times. At the end of the 19th and 20th, many scientific works came out to prove beyond a reasonable doubt that the oak leaves and anything from oak were dangerous to guinea pigs.

Guinea pigs, like most animals, have an uncanny sense of smell. They are quite picky about what they eat. They usually smell whatever they are having before putting them in their mouth. They know whether to eat something or not. But this insight is not innate. It is built on a learned system.

Left in the wild, older animals teach the guinea pigs what to eat and what not to eat, but you are responsible for their food safety when you domesticate them. Sometimes, domesticated guinea pigs mistakenly take up these oak leaves during foraging, which will have a detrimental effect on their digestive system.

The digestive system of guinea pigs is very sensitive. They cannot digest any food that has salt, fat, and sugar. They cannot also digest oak leaves.

It is, therefore, vital that you take complete care and watch what your guinea pigs ingest. You should be more careful if you are raising your guinea pigs where there are oak trees.

What Happens When Guinea Pigs Ingest Oak Leaves?

There are many dangerous things for guinea pigs to eat like dairy products, sweets, and meat. Guinea pigs are predominantly herbivores, meaning they eat plants more. It would be best if you were careful when giving them anything that is not plant-based.

Even though guinea pigs are herbivores and eat lots of vegetables, not all vegetables are right to be given to them. Again, there are foods that guinea pigs require only in small quantities. If you give them those in excess, you will cause them severe health issues.

The oak leaf is one of the vegetables that should not even feature in guinea pigs’ meals because they lead to a condition known as Oak poisoning.

Oak poisoning can be a massive problem in livestock farming, especially in places where oaks are planted. Many oak parts are toxic: the leaves, the acorns, the buds, and the blossoms.

Signs of Oak Poisoning

What Happens When Guinea Pigs Ingest Oak Leaves

Oak poisoning signs show between eight to fourteen days after your guinea pigs have ingested the oak leaves.

Loss of Appetite and Listlessness

The first sign is appetite loss and listlessness. You will notice that your guinea pigs are no longer active as before. They would rather crouch at a corner instead of being active as usual.

Ragged Haircoat

The second obvious sign that oak leaves have poisoned your guinea pigs is their hair coat. They become rough. The animals, on the other hand, begin to look haggard. This is because the poison is having a toll on their digestive system.

Digestive Problems

If you still do not take note, severe constipation sets in eight days after the guinea pigs have eaten the plant. Bouts of severe diarrhea follow this. The excreta will contain blood and mucus.

Guinea pigs are peculiar animals. They cannot vomit, which is a significant concern because vomiting expels a large chunk of the poison from the guinea pig’s body. But since the guinea pigs cannot vomit, the poison stays in their system. That is why it is necessary to guard and closely watch what your pets eat.

Inordinate Affinity to Water

Poisoned animals are usually drawn to water. They tend to stay near the water and drink frequently, but they only take a little water on each occasion.

Weight Loss and Anemia

The guinea pigs could become anemic, and loss of weight may become apparent.

Respiratory Problems

The poisoning does not affect breathing immediately. The breathing of the guinea pig is normal during the period of sickness. However, the pulse of your pet will be slower and weaker than the pulses of healthy animals. The pulse becomes rapid if the guinea pig is nearing death.

Nasal Discharge

Another sign of oak poisoning is nasal discharge. This discharge is usually frequent and has blood in it.

Distended Abdomen

The abdomen of the guinea pig is distended because of ascites.


Females can lose their pregnancy if they ingest oak leaves, but this not very common.

Dehydration Due to Constant Urination

Constant urination is one of the signs of oak poisoning. The body system of the guinea pig tries to remove as much of the toxins as possible. This constant removal of waste from the body can cause dehydration.


In severe cases, especially among young guinea pigs, death may occur after they suffer a bout of illness for 24 hours.

What Do You Do When Your Guinea Pigs Eat Oak Leaves?

There are a few things you can do when you suspect that your pets have eaten oak leaves. Here there are:

  1. Get your pets to take a lot of water. Water will cause their kidneys to get to work. Excess water will cause the kidney to work harder in expelling urine from the body, and in the process, the guinea pigs will eject some of the toxins in the oak leaves that were ingested.
  2. Though the loss of appetite is one of the symptoms of oak poisoning, feeding the guinea pigs with better and safer foods can mitigate oak leaves’ effect.
  3. Parenteral fluids, rumen stimulants, and mineral oils can be used to combat dehydration.
  4. Give your guinea pigs pellet supplements containing ten to 15% of calcium hydroxide. This is effective as an antidote for oak poisoning. You can administer one kg of the pelleted supplement daily for maximum results.
  5. The addition of one kilogram of Polyethylene glycol in water or food is effective against the poison. It will bind to the tannins and subsequently reduce the damage to body tissues. Tannins are culprits. They are a particular chemical in oaks that cause poisoning.
  6. Activated charcoal and Purgatives like magnesium sulfate can work in the battle against ingested oak poison. They are most effective when you use them in the early stages of the disease.
  7. While all these other options listed above are useful, your best bet is to take your guinea pigs to the vet. Go with the particular leaf you suspect they ate and fill the vet, if possible, on the amount ingested. This will aid the vet in providing quick solutions to troubled pets.


Once again, can guinea pigs eat oak leaves? The answer is a firm no.

If you discover the disease early, total recovery from oak poisoning can occur in the space of 60 days. If you find out the condition late, it could end in kidney failure or, worse, death. The adage still holds, ‘Prevention is better than cure.’

You should keep oak leaves away from where your guinea pigs graze as oak poisoning can have debilitating effects on them. Knowing that guinea pigs have such a sensitive digestive system, it is imperative that you watch what they eat closely.

Do not experiment with your pets’ food. Stick to what they are familiar with and what has been proven to be safe. Unfamiliar foods will put off the guinea pigs.

Photo of author

Frank Kane

Ever since I was a child, I’ve been head-over-paws for all creatures, great and small. I’m on a mission to help other pet lovers better understand, care for, and enjoy life with their furry, scaly, or feathery friends.

Leave a Comment