What foods are toxic to rabbits?
Diet and Hydration

8 Foods That Are Fatal to Rabbits (or Must NEVER Be Fed to a Rabbit)

Rabbits do not eat the same foods as most other pets, so we should be aware of their unique dietary needs. Above all, we should know which foods are poisonous to rabbits.

Rabbits should never be given avocado, fruit pips, or rhubarb. Even small amounts of these foods can be fatal to rabbits. Other foods such as muesli, dog/cat food, and nuts are not ‘toxic,’ but they can cause illness if consumed regularly.

Rabbits who are fed the correct diet are less likely to graze on unhealthy (or toxic) foods. That’s why it’s so important to give your rabbit a species-appropriate diet. As mentioned, rabbit dietary advice can be a bit puzzling, so we’ll clear up some of the confusion.

What Foods Are Rabbits Not Allowed to Eat?

Rabbits eat up to 30 times per day, so they need a steady supply of healthy food.  Otherwise, they’ll start foraging for things they are not allowed to eat.

There are lots of foods that rabbits should not eat, but only some of these foods will cause a fatal reaction. ‘Toxic’ foods are those that can cause immediate death.

In contrast, ‘unhealthy’ foods will not cause immediate death. Even so, they can lead to severe diarrhea, weight loss/gain, or other health problems.

1) Avocados

Avocado is one of the most dangerous foods for rabbits. This is because avocado contains a toxic compound called Persin. If a rabbit ingests too much Persin, they will quickly develop breathing problems. This can lead to heart failure and eventual death, in some cases.

If a rabbit steals just one or two bites of avocado, they may not have a severe reaction. However, you should still contact your vet for advice if this happens.

2) Fruit Pips and Seeds

Although small amounts of apple flesh are OK, apple seeds are a no-no. Apple seeds contain a compound that is toxic to rabbits. So, if you serve up some apple as an occasional treat, make sure the pips have been removed.

It’s not just apple pips that are harmful, but apricot, peach, and plum pits, too. These contain trace amounts of cyanide that can be fatal to rabbits.  Rabbits should not be fed any fruit pip, seed, or pit in case there is an adverse reaction.

3) Rhubarb

Rhubarb is an irritant, and it can cause severe reactions in rabbits. Also, rhubarb contains a high concentration of oxalates. These can interfere with calcium absorption. So, if you grow rhubarb in your garden, make sure your rabbit does not have access to it.

Symptoms of rhubarb poisoning in rabbits include:

  • A swollen or sore mouth
  • Diarrhea
  • Bloated or sore tummy
  • Drinking lots of water
  • Lethargy

Although the symptoms can be severe, death due to rhubarb poisoning is quite rare if bunnies are taken to the vet for treatment.

4) Chocolate

Chocolate contains two types of methylxanthines that are very harmful. These are:

  • Theobromine
  • Caffeine

The higher the cocoa content, the higher the concentration of methylxanthines. So, if your rabbit were to eat a few squares of dark chocolate, this would be a medical emergency. Nevertheless, even white chocolate can cause a severe reaction in some bunnies.

According to PDSA, symptoms of chocolate poisoning include:

  • Diarrhea. Vomiting would usually apply, but rabbits cannot vomit
  • Restlessness
  • Squirming when you try and touch their tummy
  • Trembling and panting
  • High temperature

Although most of us would not ‘treat’ our rabbits with chocolate, most of us do leave packets of half-opened chocolate lying about the house. This is risky when there are pets inside the home. So, try to get in the habit of shutting chocolate away.

5) Allium Vegetables

Allium-type vegetables can cause serious illness in rabbits. These veg include:

  • Onions (red and brown)
  • Garlic
  • Shallots
  • Chives

The problem with these vegetables is that they can cause hemolytic anemia (loss of red blood cells). This can cause dizziness, weakness, and eventual death if not treated.

If that were not enough, allium-type vegetables can also cause anaphylactic shock in some rabbits.

6) Iceberg Lettuce

We quite literally refer to lettuce as “rabbit food,” so surely it can’t be toxic for rabbits? Well, dark forms of lettuce (i.e., Romaine) are suitable for rabbits. But iceberg lettuce is not healthy because it contains a harmful chemical called lactucarium.

Lactucarium is not usually harmful in small amounts, but a large portion of iceberg lettuce could cause diarrhea and weakness. Very young bunnies could even die from overeating iceberg lettuce.

7) Potato Leaves

Potatoes are not a great food source for rabbits because they are high in starch. This makes potatoes difficult to digest, but not poisonous.

A small amount of potato may not do any harm to a rabbit. However, potato tops and leaves could be poisonous. As such, they should never be fed to a rabbit.

8) Sugary Processed Foods

When you’re enjoying a cookie or a piece of cake, you may be tempted to give your bunny a bite. But this is a terrible idea. According to MSD, sugary, high-carb foods can trigger Enterotoxemia in rabbits. This is a severe case of diarrhea that is often fatal.

Enterotoxemia occurs when there is an overgrowth of Clostridium-type bacteria in the rabbit’s cecum (the pouch between the small and large intestine). These bacteria release a toxin that is fatal to the rabbit. It’s thought that sugary, high-carb foods encourage the bacteria to multiply.

While a single serving of sugary foods is unlikely to trigger Enterotoxemia, it could happen in very young or weak rabbits. Also, rabbits that don’t eat enough fiber are particularly susceptible.

what foods are rabbits not allowed to eat?

What to Do If your Rabbit Eats Something Toxic

If your rabbit has eaten one of the above foods, you should speak to your vet immediately, since many of these foods can cause death in a matter of hours.

As mentioned, foods like iceberg lettuce and cookies are less likely to be fatal to healthy, adult rabbits. But, it’s still a good idea to contact your vet if you’re bunny has eaten these foods. Your vet can advise if any treatment is required.

At times, rabbits eat something toxic without us realizing. We may only come to realize when our rabbit falls sick. Concerning symptoms to look out for include:

  • Diarrhea or vomiting
  • Glazed over eyes
  • Weakness
  • Drinking much more than usual
  • Restlessness

Foods Rabbits Should Avoid

Some foods are not ‘toxic’ to rabbits but should nonetheless be avoided. These foods are unhealthy and can cause disease over time. To be specific, these foods are difficult to digest and are usually very high in calories. This means they can cause tummy pain and obesity.

If your rabbit steals a bite of these foods now and then, this won’t cause any serious harm. However, it’s essential to be aware of these foods, so you don’t feed them to your rabbit regularly. So, here are some foods rabbits should avoid.

1) Muesli

Remember we said sugary, high-carb foods are bad for rabbits? Well, muesli falls into this category. Muesli-based rabbit feed was once a popular pet food for rabbits, but we now know that it’s unhealthy. This is because a high-carb/high-sugar diet can lead to:

  • Dental disease – According to BMJ, dental disease is “extremely common” in rabbits fed a muesli-based diet.
  • Diarrhea and tummy problems
  • Weight gain
  • Enteroteoxema – in severe cases

In theory, muesli should be healthy because it contains some high-fiber pellets. However, most rabbits tend to pick out the pieces of cereal because these are tastier than the pellets. As a result, the rabbit consumes too much carbohydrate.

2) Nuts

Most rabbits love the taste of nuts, but these are not a good food choice. Firstly, they are very high in fat. This is a problem because rabbits need a relatively low-fat diet to thrive. The high-fat content may cause digestive issues and bowel problems.

Secondly, nuts are a choking hazard, especially to younger rabbits.

3) Cat or Dog Food

In multi-pet households, it’s quite common for animals to share (or steal) each other’s food. And in some cases, rabbits do develop a taste for dog/cat food. But is it safe for rabbits to eat dog/cat food? While this food is not toxic, you should not encourage this behavior.

Firstly, these foods are relatively high in calories so eating them will probably cause weight gain.

Secondly, most dog/cat foods contain animal protein. Rabbits are herbivores so they do not have the necessary enzymes to digest meat. Added to which, these foods contain amino acids, vitamins, and minerals that may be unnecessary – or even harmful.

To be specific, the biggest concern is calcium. Rabbits should be fed a low calcium diet because high levels of calcium can lead to kidney stones and urinary tract infections. Cat and dog foods contain added calcium, so this is not an ideal food for rabbits.

4) Cauliflower

Given that rabbits are herbivorous, you might assume that it’s OK to give them any vegetable. Unfortunately, this is not the case. Rabbits can eat quite a few different vegetables, but cauliflower is not one of them. Whether it is raw or cooked, cauliflower can cause severe bloating in rabbits.

5) Parsnips

Although parsnips are acceptable in small amounts, they are not a recommended food for rabbits. Parsnips contain a lot of starch so they may be difficult to digest. Added to which, they are relatively high in calories, so eating them regularly will cause weight gain.

6) Raisins

Raisins are not suitable for rabbits. To begin with, they are very high in sugar so they will be difficult to digest (and may even cause Enterotoxemia). Also, according to TandF, raisins can obstruct the exit of the stomach if they become lodged there.  This can lead to all sorts of medical problems.

Rabbits quickly develop a taste for raisins, so you might feel like your denying your rabbit their favorite treat. But there are plenty of healthier ways to treat your rabbit, as we will explore.

What Can Rabbits Eat?

So far, we’ve discussed what rabbits cannot eat. So, this begs the question, what can rabbits eat? Well, this is the optimum diet for an adult rabbit:

  • Unlimited Grass Hay – Grass hay is a requirement for all rabbits whether you feed them pellets or not.
  • Leafy Green Vegetables – 1 cup of greens per pound of body weight per day
  • Unlimited Water – Most rabbits prefer to drink from a bowl

The following are optional and can help to enhance a rabbit’s diet (if given in the correct portions):

  • High-Fiber Rabbit Pellets – Typically 25 – 50g per day
  • Other Vegetables (celery, broccoli, bell peppers, etc.) – No more than 1 tablespoon per pound of body weight per day
  • Fruit – Occasionally, in tiny amounts
  • Access to Growing Grass for Grazing

Rabbits have unique dietary requirements, especially in relation to other pets. If you don’t meet these requirements, your rabbit may become very sick. Also, a hungry rabbit is more likely to graze on unhealthy (or toxic) foods. So, let’s review these dietary requirements in a bit more detail.

foods rabbits should avoid

The Importance of Fiber for Rabbits

As we know, rabbits are herbivores, so their gastrointestinal (GI) tract can handle a very high-fiber, low nutrient diet. In contrast, their GI tract cannot handle large amounts of fat, protein, or starch.

So, what’s the best source of fiber for rabbits? Well, rabbits should get most of their fiber from hay. According to MAG, hay should comprise 80% of a rabbit’s diet. Timothy hay is ideal due to its low calcium and low protein content. Each day, provide your rabbit with a bundle of hay that’s at least as big as them.

Hay is a great choice for rabbits because the act of chewing helps to keep their teeth healthy. Not only that, it may help to prevent Enterotoxemia by cleaning the GI tract.

In addition to hay, rabbits should be given moderate amounts of leafy green vegetables and small portions of other vegetables. These provide additional fiber as well as water, vitamins, and minerals.

What Vegetables Can I Feed My Rabbit?

Given the sheer variety of vegetables, it’s hard to remember which are safe for rabbits and which are not. In terms of leafy greens, the following vegetables are safe for rabbits:

  • Curly kale
  • Spring greens
  • Rocket
  • Small amounts of Romaine lettuce
  • Dark green cabbage
  • Beetroot greens
  • Radish greens

You should feed your rabbit 1 cup of greens per pound of body weight (per day). The average bunny is around 5 pounds so that’s 5 cups of greens.  You can split these into small portions because rabbits feed up to 30 times a day.

Also, rabbits can be fed small amounts of the following vegetables:

  • Broccoli
  • Celery
  • Bell pepper
  • Jerusalem artichoke
  • Celeriac

The appropriate portion size is 1 tablespoon per pound of body weight per day. Rabbits can also be fed small amounts of herbs such as Basil, Dill, and Mint.

Rabbit Pellet Portion Size

Most pet owners will supplement their rabbit’s diet with pellets. Pellets can be beneficial because they provide protein, nutrients, and additional fiber. However, it’s important not to overfeed your rabbit.

As mentioned, the bulk of a rabbit’s diet comes from hay, so they don’t need a huge serving of pellets (typically 1 egg cup per day). The only exception is if your rabbit is underweight. In this case, alfalfa hay and/or a large serving of pellets can be used to bulk them up.

When shopping for pellets, choose a high-quality, high-fiber variety.

Healthy Treats for Rabbits

There’s nothing we love more than treating our pets. But when it comes to rabbits, we must be cautious. As discussed, many foods that we think are OK for rabbits are actually very harmful. So, what is a good treat for rabbits? Here are some options:

  • Brussel sprouts (make sure the stalk is not attached as this can be very tough)
  • Small pieces of apple (remove any pips)
  • Small amounts of carrot/carrot tops
  • Small pieces of sweet potato

Fruit should not be given every day because it can damage the rabbit’s teeth.

What If My Rabbit Won’t Eat Hay?

Sometimes, rabbits don’t take an interest in hay. This is problematic because, if they don’t curb their appetite with hay, they’re more likely to overeat on pellets. Or, they’ll steal poisonous foods such as chocolate or cookies. If your rabbit seems to dislike hay, try the following:

  • Choose a high-quality variety that’s free from dust.
  • Your rabbit may prefer a different variety so try hay cubes, kiln-dried grass, and hay cookies.
  • Pull apart the hay a little and sprinkle some herbs inside.
  • Stuff some of their hay inside a cardboard tube, so they need to work harder to get at it. This can make the hay more interesting.
  • Reduce the number of pellets but do so gradually (see below).

If your rabbit cannot be persuaded to eat hay, this could be due to dental disease or another health problem. Consult your vet for advice.

Changing a Rabbit’s Diet

If you’d like to improve your rabbit’s diet, it’s important to make dietary changes gradually. This will give your rabbit’s GI tract time to adjust. Rabbits can become very sick if their diet is altered suddenly.

So, if your rabbit is eating a muesli-based feed, you should try and replace this with some good-quality pellets. The RSPCA recommends doing this over 2-3 weeks. So, each day, slightly decrease the amount of muesli and increase the number of pellets. At the end of the third week, your rabbit should only be eating pellets.

Secondly, you may want to offer your rabbit a wider variety of vegetables. Variety is a good thing, but it’s essential to make changes gradually. Reintroduce one new vegetable at a time, and closely monitor your rabbit’s bowel habits.

Finally, as mentioned, the bulk of your rabbit’s diet should be hay. If they are not eating enough hay, follow the tips mentioned above. If you are feeding too many pellets or vegetables, these should be reduced gradually over 2-3 weeks. If your rabbit doesn’t increase their intake of hay in response, speak to your vet.

Food Safety Tips for Rabbit Owners

As rabbit owners, one of our greatest fears is feeding our rabbit something toxic. We mustn’t do this. But it’s also crucial that we feed our rabbit a species-appropriate diet. So, here are some food safety tips to remember:

  • Although rabbits are herbivorous, some fruits and vegetables can cause fatal reactions. These include rhubarb, avocado, allium-type vegetables, and iceberg lettuce.
  • Also, the leaves of potato plants can be toxic to rabbits.
  • In terms of garden plants, most plants that grow from bulbs are poisonous to rabbits.
  • A rabbit’s gastrointestinal tract cannot handle large amounts of carbs or sugar. Root vegetables (such as parsnips, sweet potato, etc.) are OK in small quantities. But rabbits should never be given processed carbs (biscuits, cakes, etc.).
  • Small pieces of fruit (i.e., apples) can be given as an occasional treat, but the pips/seeds must be removed.
  • Hay should form the bulk of a rabbit’s diet as this will help to promote good gastrointestinal health. It will also prevent unhealthy snacking.
  • Unlimited water should be provided, and most rabbits prefer to drink from a bowl rather than a bottle.

The most important tip is to stay cautious. Only feed your rabbit something if you are 100% sure that it’s safe. Rabbits’ dietary requirements aren’t intuitive, so it’s best not to make any assumptions.