Do Rabbits Need Sunlight?

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Most people know that it’s important for humans to get sunlight every day, but do rabbits need sunlight too? In this blog post, we’ll discuss the importance of sunlight for rabbits and how much exposure they need each day. We’ll also dispel some common myths about sun exposure for rabbits.

Why is Sunlight Important For Rabbits?

According to Dr. Laurie Hess, rabbits’ teeth and bones may benefit from direct (not through a window) sunlight exposure. Sunlight helps a rabbit’s body produce vitamin D3, which is necessary for rabbits to absorb calcium from their diet.

There are a few health issues that rabbits can have if they don’t get enough sunlight. They can develop vitamin D deficiency, which can lead to problems with their bones and muscles. They can also develop eye problems and skin problems.


If a rabbit doesn’t get enough vitamin D3, it can lead to a condition called secondary hyperparathyroidism. This is when the body increases its production of parathyroid hormone in an attempt to counteract the low blood calcium levels caused by inadequate vitamin D3.


Rabbits can also suffer from a condition called osteodystrophy if they don’t get enough sunlight. Osteodystrophy is a condition caused by a lack of vitamin D3 and calcium, which causes a rabbit’s bones to grow very weak and brittle.


Osteoporosis is another condition caused by a lack of vitamin D3 and calcium and makes a rabbit’s bones very fragile. Both osteodystrophy and osteoporosis can be fatal, which is why it’s important to make sure your rabbits get enough vitamin D3 and calcium from sunlight!

In fact, studies show, that calcium supplementation can help increase bone mineralization under osteoporotic conditions in rabbits by increasing the amount of calcium available for the bones. This can help make the bones stronger and less likely to break.

sunlight exposure benefits in rabbits

Along with Vitamin D, sunlight provides many other health benefits for rabbits like:

  • Helping your rabbit’s body fight off infections by strengthening its immune system (this is why it’s important to make sure your rabbits get enough sunlight even if they’re on antibiotics).
  • Maintaining your rabbit’s circadian rhythm by allowing them to know when it’s time to go to sleep and when it’s time to wake up.
  • Producing serotonin in the brain, which is a “feel good” hormone that makes your rabbits happy and relaxed.
  • Vitamin D is regulating your rabbit’s digestive system by stimulating the production of bile (this is why it’s important to make sure your rabbits get enough sunlight even if they’re on special diets).

Along with all of these health benefits, sunlight also provides rabbits with mental stimulation and allows them to express natural behaviors. This is important because most pet rabbits are kept in hutches or cages all day long, which can cause boredom and stress.

Again, keep in mind that rabbits can’t produce Vitamin D without sunlight. If they are kept in low light conditions, it’s unlikely that they will get enough of the nutrients they need to stay healthy. Also, it’s important to note that rabbits should never be caged in direct sunlight due to the risk of overheating.

How Much Sunlight Does a Rabbit Need?

The amount of sunlight a bunny needs each day in order to stay healthy varies depending on the breed, age of the bunny, lifestyle, and physical environment.

According to VCA Animal Hospitals, some bunnies may need as little as 30 minutes on a grassy surface while others may require more than an hour.

Rabbits receiving adequate sunlight should be deeply tanned on their ears. When bunnies don’t receive enough sunshine, their bodies will try to create Vitamin D from the liver instead. This results in a condition called Bunny Degenerative Joint Disease (BDJD) which can cause severe pain in their limbs.

Most bunnies are able to receive the Vitamin D they need from direct sunlight, but bunnies can also benefit from indirect sunlight such as on a windowsill. Bunnies who receive the majority of their sunshine from window light should still spend time outdoors in direct sunlight to be sure they’re receiving the full benefits of exposure.

How Can I Make Sure My Rabbit is Getting Enough Sunlight?

rabbit on a harness in the sunlight

The best way to make sure your bunny is getting enough sunlight each day is by providing supervised outdoor time in a safe environment. Make sure there are no dogs or other predators around and be sure to put your bunny on a harness so he doesn’t get away.

Many pet parents prefer to use playpens for this purpose but ensure the pen has high enough fencing to keep predators out while exposing your rabbit to lots of natural sunlight.

There are no studies that tell you exactly how much time your bunny needs to spend outside, but according to Dr. Hess, In optimal weather conditions, it would be beneficial to let your rabbit outside for a few hours per day.

From personal experience, for “indoor pet rabbits” screened-in porches and terraces are the optimal solution for your rabbits to safely spend some time outdoors, also this time is great for bonding with your rabbit.

If you live in the northern half of the United States or anywhere else that sees a lot of winter, your bunny will need more sunlight in order to stay healthy.

Here in Minnesota, our rabbits need more sunlight than usual starting around November when the days grow shorter. For pet parents who can’t provide supervised outdoor time for their bunnies, there are always options like bunny sun lamps that offer artificial sources of ultraviolet light.

Bottom Line: Do Rabbits Need Sunlight?

rabbit outside lying on the grass

In conclusion, rabbits need sunlight as much as humans but there are certain factors that can change how much they need.

The best way to make sure your bunny is getting enough sunshine each day is by providing supervised outdoor time in a safe environment. If this is not possible, there are always options like bunny sun lamps that make it possible to give bunnies the sunlight they need.


“The effect of calcium and vitamin D supplementation on osteoporotic rabbit bones”

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