A new study found that overweight and obese dogs have significantly higher eye pressure than lean dogs, with pressure increasing by 1.9 mmHg for every one-unit rise in body condition score. The research suggests that excess body fat and related metabolic changes may interfere with fluid drainage in the eye, potentially serving as a modifiable risk factor for dogs predisposed to glaucoma. These findings emphasize that maintaining a healthy weight is a vital part of protecting a dog's long-term vision and ocular health.
A new study led by Dr. Oren Pe’er from the Koret School of Veterinary Medicine at The Hebrew University of Jerusalem has found a clear link between a dog’s body weight and the pressure inside their eyes. While many owners are aware that excess body weight can contribute to systemic conditions such as insulin resistance, diabetes mellitus, chronic low-grade inflammation, and orthopedic disease, this research suggests that obesity may also be an important risk factor for serious ocular conditions, including glaucoma.
The Weight-Eye Connection
The study looked at 40 healthy dogs, ranging from lean to obese. Researchers measured the dogs' body fat using several methods, including a 9-point body condition score and a canine version of the body mass index.
The results showed a significant difference in eye health based on weight:
Why Does This Happen?
Scientists believe several factors might be at play. Physical changes like fat accumulation around the eye or increased venous pressure might make it harder for fluid to drain. Additionally, metabolic changes caused by obesity, such as higher levels of certain fats and hormones in the blood, could influence eye pressure.
In the study, overweight dogs had higher levels of triglycerides and leptin, which is a hormone related to body fat. Both of these were linked to higher eye pressure in the initial findings.
"Higher body condition in normal dogs is significantly associated with higher intraocular pressure," says lead researcher Dr. Oren Pe'er. "Obesity might be a modifiable risk factor in dogs predisposed to glaucoma."
What Can Owners Do?
While the eye pressure in both groups of dogs was still within the normal range of 10 to 25 mmHg, the difference of 6.6 mmHg between the lean and overweight dogs is notable. For breeds already at risk for glaucoma, this extra pressure could be a relevant factor in their long-term eye health.
The main takeaway for pet parents is that weight management is not only about mobility or general wellbeing. Maintaining a healthy body condition plays an important role in preserving normal ocular physiology and reducing the risk of eye disease, particularly in breeds that are already predisposed to ocular problems.
Journal of Veterinary Internal Medicine
Experimental study
Animals
Relationship between body adiposity, metabolic status, and intraocular pressure in dogs
8-Feb-2026