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Can Rabbits Eat Romaine Lettuce?

Can Rabbits Eat Romaine Lettuce?

If rabbits could speak, they would tell you that lettuce is one of their favorite things to munch on. Yet, first of all, bunnies cannot speak for themselves, and second, they do not know what is good for them.

Luckily, you are there to help. Your bunny is a lucky one since the mere fact that you are here and reading this means you are a responsible owner and you care about your pet’s health and well-being.

So, we will help you. You deserve it.  We will start by answering the following questions for you: Can rabbits eat romaine lettuce? Is romaine lettuce healthy for your bunny, or is it dangerous?

Stay with us to find out all the answers!

Can Rabbits Eat Lettuce?

Your bunny is probably a fan of lettuce. It is tender, green & leafy, and tasty – so, how could your furry friend possibly resist it?

So, can rabbits eat lettuce or not?

Unfortunately, lettuce can be dangerous for rabbits – especially when eaten in excess amounts. Too much lettuce can make your bunny sick.

Are All Types Of Lettuce Dangerous?

All types of lettuce carry a certain amount of risk, but some are far more dangerous than others.

It is all due to white fluid called the lactucarium. You can see this fluid when you break a lettuce stalk. This fluid looks like milk, and that is why it is called lactucarium in the first place – it is Latin for milk. 

Different types of lettuce contain different amounts of this fluid. The ones that have the highest concentration of lactucarium are the most dangerous for your bunny to eat.

For example, Iceberg lettuce contains the highest amount of lactucarium and should thus best be avoided when it comes to your bunny’s diet.

What About Romaine Lettuce?

The good news is that romaine lettuce has one of the lowest concentrations of lactucarium in comparison to all other types of lettuce. We’ll get back to this fortunate fact later on, but first, let’s learn more about lactucarium and why it is so dangerous for bunnies.

What Are The Effects Lactucarium Can Have On Your Bunny?

The fact that the lactucarium is often called “the rabbit opium” says a lot about the effects it has on our little furry friends. Namely, the rabbit that has consumed this milky fluid will act a lot like a person that uses opium.

At first, the rabbit experiences a sense of euphoria, but then it goes into a mild trance. A bunny feels relaxed and will most likely doze off too. In this case, the lactucarium acts as a sedative.

It doesn’t sound so bad? Well, that’s not all.

When consumed in excess, the lactucarium can cause stomach upsets and diarrhea. In some cases, if left untreated, or when the rabbit continues to ingest large amounts of this harmful fluid, lactucarium can prove to be fatal for bunnies.

So, even though the lactucarium is a naturally occurring substance, it can endanger your rabbit’s health and well-being or even its life. Therefore, make sure your bunny never has too much of this fluid.

Can Rabbits Eat Romaine Lettuce? Is There A Risk Of Over-consumption?

As we have already mentioned, romaine lettuce contains the least amount of lactucarium of the most common lettuce varieties, and that makes it safe for your bunny to enjoy. Of course, you still need to be careful and limit the amount of romaine lettuce your rabbit can have.

How Much Romaine Can Your Bunny Have?

Your bunny can freely enjoy up to two cups of romaine lettuce every couple of days. Three times a week should be your maximum. 

There is a slight risk of over-consumption but still, be cautious. If your bunny seems too sleepy or has some digestive issues such as diarrhea, discontinue giving it lettuce, and best visit the vet.

How To Serve Romaine Lettuce To Your Bunny?

We already gave you a hint to use cups and measure the amount of romaine you can feed to your bunny that day.  You can chop the lettuce up or serve whole leaves – it is up to you and your bunny’s preferences.

In order to boost digestion and possibly avoid the problems we have mentioned earlier, combine romaine lettuce with snacks that are high in fiber. An apple a day can keep the vet away!

It goes without saying that you must avoid the stalk since it is packed with lactucarium. What about the heart? Can rabbits eat romaine hearts or not?

It would be perfectly fine for your rabbit to eat romaine hearts, but there is no need to pay extra money for them when you can buy a whole head of romaine and save a few bucks. After all, the outer, darker green leaves are more nutritious. The greener, the better!

Why Is Romaine Lettuce Good For Rabbits?

Romaine is worth the slight risk of over-consumption since it has numerous health benefits.

When you offer your bunny dark leaves of romaine lettuce, you provide it with numerous essential nutrients but also help it stay hydrated.

So, with no further ado, here is what romaine lettuce brings to the table:

  • Water: Romaine, just like all the other types of lettuces, is high in water, and thus it helps keep your bunny stay hydrated. It is especially handy as a summer treat, but be careful not to overdo it – too much water can cause runny stools too.
  • Fiber: Rabbits require a high-fiber diet, and it is your job to secure it.  Lettuce is a good source of fiber while it contains almost no carbohydrates or protein.
  • Antioxidants: antioxidants reduce the risk of certain types of cancer. They also help maintain your rabbit’s heart health.
  • Vitamin A: Your bunny cannot wear glasses, so you need to make sure its eyesight remains sharp – this is where vitamin S kicks in to help. It also helps maintain the health of your bunny’s internal organs, such as kidneys and lungs.
  • Vitamin K: In the case of vitamin K insufficiency, your bunny is at risk of developing blood clots. This valuable vitamin also helps transport vital minerals around your bunny’s body.
  • Folic Acid: Folic acid enhances the production of red blood cells and prevents anemia. It also strengthens your bunny’s immune system.
  • Electrolytes: Electrolytes such as potassium and magnesium help maintain an optimal heart rate. 
  • Phosphorus & Calcium: These minerals work together to make sure your bunny has healthy teeth and bones.

On the downside, too much calcium can cause urinary infections in rabbits by thickening their urine and turning it into a sludge. 

Romaine lettuce1
Calcium2.6 mg
Potassium17.8 mg


Your bunny needs a well-balanced diet packed with fiber. Lettuce can help, but not all types of lettuce are safe for your pet. Iceberg lettuce should, for example, be avoided while romaine lettuce is perfectly fine.

The main difference is in the amount of milky fluid called the lactucarium. Namely, Iceberg lettuce has the most of this fluid while romaine lettuce has the least of it. Considering the fact that lactucarium can be deadly for bunnies, romaine lettuce is the only of the two that is safe for your furry pet. 

As long as your bunny has enough hay, an occasional romaine lettuce snack can only do good. It is packed with valuable nutrients as well as high in water and fiber.

There is one more reason that goes in favor of romaine. Your bunny will surely appreciate the crisp texture and superior richness of flavor romaine lettuce brings to the table. 

Learn More: What Can Rabbits Eat? The Entire Diet For Your Rabbit