Corneal ulcers are acutely painful eye injuries in dogs that require prompt veterinary treatment to prevent vision loss and relieve significant ocular pain — yet they are often initially underestimated by owners.
Corneal ulcers cause intense, acute pain that is often underappreciated because dogs cannot communicate eye pain verbally and owners may interpret squinting as minor irritation. The high density of pain receptors in the cornea — a functional adaptation for protecting this critical structure — means that even small ulcers cause significant nociceptive pain. Dogs with corneal ulcers experience pain with every blink, with light exposure, and with eye movement. Without adequate analgesia and treatment, affected dogs are in constant, severe discomfort. The risk of progressive "melting" ulcers — where bacterial collagenases destroy corneal tissue rapidly — means that delays in treatment convert a welfare emergency into a sight-threatening one. E-collars to prevent self-trauma are essential but must be appropriately sized; inadequately fitting collars allow pawing that worsens the injury and extends welfare compromise.