Yes, rabbits have cannabinoid receptors. They possess both major types, CB1 and CB2, along with the internal signaling molecules that activate them. This means rabbits have a fully functional endocannabinoid system, much like humans, dogs, cats, and other mammals.
CB1 and CB2 Receptors in Rabbits
Rabbits express both CB1 and CB2 cannabinoid receptors throughout their bodies. CB1 receptors appear primarily in the brain but are also found in other tissues, including the eyes and the smooth muscle cells of the stomach. CB2 receptors are concentrated in the peripheral immune system, showing up in circulating immune cells, the spleen, and specialized cells in bone and the liver.
Research on rabbit gastric smooth muscle cells has confirmed that CB1 receptors function the same way they do in other mammals. When activated, they trigger a specific signaling pathway that reduces a cell’s production of a key energy molecule (cAMP), which is how cannabinoid receptors slow down certain cellular activities. This is the same basic mechanism seen across species.
CB2 receptors in rabbits play a role in immune regulation. They’re also distributed throughout the gastrointestinal tract, where they help modulate gut motility, immune tolerance, visceral pain signaling, and inflammation.
Rabbits Produce Their Own Cannabinoids
Beyond just having the receptors, rabbits manufacture endocannabinoids, the body’s own cannabis-like molecules. The two primary ones are anandamide and 2-AG, both of which have been directly measured in rabbit lung tissue. Native rabbit lungs contain roughly 99 picomoles per gram of anandamide and 19.6 nanomoles per gram of 2-AG.
Rabbits also produce the enzymes that break these molecules down after use. FAAH, the main enzyme responsible for degrading anandamide, has been detected in rabbit lung tissue through genetic analysis. When researchers blocked this enzyme in isolated rabbit lungs, anandamide’s effects on blood pressure within the lungs changed dramatically, confirming that FAAH actively regulates endocannabinoid signaling in real time. This complete package of receptors, signaling molecules, and breakdown enzymes constitutes a working endocannabinoid system.
Cannabinoid Receptors in the Rabbit Eye
One of the most studied areas of rabbit cannabinoid biology is the eye. Researchers have demonstrated that activating CB1 receptors in the eyes of New Zealand White rabbits lowers intraocular pressure (the fluid pressure inside the eye) in a dose-dependent way. At the highest dose tested, pressure dropped by an average of 4.7 mmHg in the treated eye, while the untreated eye on the opposite side showed no change.
This effect was confirmed to work specifically through CB1 receptors. When a selective CB1 blocker was applied alongside the cannabinoid compound, the pressure-lowering effect was significantly reduced. This line of research has made rabbits a valuable model for studying cannabinoid-based approaches to glaucoma, a condition driven by elevated eye pressure.
How Cannabinoids Affect Rabbit Digestion
Rabbits depend on a uniquely sensitive digestive system. Their cecum (a large fermentation chamber similar in function to a cow’s rumen) processes fibrous plant material with the help of specialized bacteria. Cannabinoid receptors scattered throughout the rabbit GI tract influence how quickly food moves through this system.
Research in multiple animal models, including rabbits, shows that cannabinoids tend to slow gastrointestinal motility. For rabbits, this is particularly significant. Slower gut movement means digesta sits longer in the cecum, which can alter fermentation patterns and shift the microbial community living there. CBD given to rabbits has been shown to affect the morphology and enzyme activity of the digestive tract, along with changes to cecal fermentation. Researchers suspect this happens through a “chymus jam” pathway, where reduced motility leads to a buildup of material in the cecum as nutrients continue flowing in from the small intestine.
Because rabbit digestion is so finely balanced, even moderate changes in gut motility can have outsized consequences. Stress alone can slow the fusus coli (a muscular structure that controls cecal emptying), leading to digestive stagnation. Cannabinoids appear to act on this same vulnerability through their receptor interactions in the gut wall.
How Rabbits Process CBD
Pharmacokinetic studies in New Zealand White rabbits have mapped out how CBD moves through their bodies after oral dosing. At a dose of 15 mg/kg given in hemp oil, CBD reached peak blood levels of about 30.4 ng/mL roughly 3.8 hours after administration when the rabbit had not eaten. The compound’s half-life (how long it takes for blood levels to drop by half) was about 7 hours in fasted animals.
Food substantially reduces absorption. When the same dose was given with a food slurry, peak blood levels dropped to 15 ng/mL and the half-life shortened to roughly 3.8 hours. Overall bioavailability was cut by about 50% when food was present. This means CBD’s effects in rabbits depend heavily on whether it’s given on an empty or full stomach.
THC Tolerance in Rabbits
Rabbits appear surprisingly tolerant of THC from a survival standpoint, though it clearly affects their health. In a 13-day study, female New Zealand White rabbits received THC at doses ranging from 3 to 100 mg/kg per day. All animals survived through the entire study period, even at the highest dose.
That said, THC caused consistent problems. Treated rabbits failed to gain weight, primarily because they ate less. Blood work revealed drops in potassium, glucose, blood urea nitrogen, and the ratio of two key blood proteins. Cholesterol levels rose across all treated groups. At lower doses (3 and 10 mg/kg), bilirubin levels increased, suggesting some degree of liver stress. The researchers concluded that while THC didn’t produce outright toxicity at these doses, appetite suppression was a clear and consistent effect. For an animal whose digestive health depends on constant fiber intake, reduced eating is a serious concern on its own.