Boric Acid
BORIC ACID
Boric acid solutions, often called “boric water,” are widely recommended online as a remedy for cleaning dogs’ eyes and removing tear stains. However, scientific evidence does not support routine use of boric acid near the canine ocular surface. Boric acid is a chemical buffering agent whose biological effects depend on formulation, concentration, and exposure conditions, and it is not inherently inert. Current research shows that ocular compatibility depends on complete formulation chemistry—not pH alone—and no controlled veterinary studies demonstrate that boric acid solutions are safe or effective for repeated periocular use in dogs. Because tear staining is primarily caused by porphyrin pigments and underlying physiological factors rather than surface dirt, cosmetic lightening does not address the cause. Evidence-based practice therefore favors veterinary-formulated products or sterile saline instead of improvised boric acid preparations
