Border Collie Age Calculator

Collie Eye Anomaly is an inherited developmental defect of the eye that affects the choroid, retina, and sclera. It ranges from mild (no vision impairment) to severe (retinal detachment causing blindness). CEA is present from birth and does not worsen over time in mild cases. The condition is caused by a recessive gene mutation, and genetic testing can identify carriers. In Border Collies, the prevalence has decreased significantly thanks to DNA testing, but it remains an important screening priority.

Prevention: CEA is entirely genetic and not preventable through management. The only prevention is responsible breeding using DNA testing — both parents should be tested and ideally clear of the CEA mutation. Puppies should receive an eye examination by a veterinary ophthalmologist between six and eight weeks of age, when mild lesions are most visible before they may become obscured.

Symptoms: no symptoms in mild cases, impaired vision in moderate cases, blindness in severe cases with retinal detachment, small or sunken eyes in severe cases, difficulty navigating unfamiliar environments

Trapped Neutrophil Syndrome is a hereditary autoimmune disorder specific to Border Collies where the bone marrow produces white blood cells (neutrophils) normally, but they cannot be released into the bloodstream. This leaves affected dogs severely immunocompromised and vulnerable to infections. TNS is caused by a recessive gene mutation, and affected puppies typically become ill within the first few months of life. Without treatment, the condition is fatal. A DNA test is available and has made this once-devastating condition increasingly rare in responsibly bred Border Collies.

Prevention: TNS is entirely preventable through responsible breeding. A DNA test identifies carriers, and breeding two carriers will produce approximately 25% affected puppies. Both parents must be tested — never breed two carriers together. There is no cure for TNS, making prevention through genetic testing the only effective strategy.

Symptoms: chronic recurring infections from early puppyhood, failure to thrive and stunted growth, persistent fever unresponsive to antibiotics, joint swelling and lameness, gastrointestinal problems including chronic diarrhea

Hip dysplasia is a hereditary condition where the hip joint develops abnormally, leading to progressive arthritis, pain, and reduced mobility. In Border Collies, the condition has moderate prevalence with approximately 12% of dogs showing radiographic evidence according to OFA statistics. The breed's extreme athleticism means that even mild hip dysplasia can become symptomatic sooner due to the high demands placed on the joint. Early detection through screening allows for management strategies that preserve quality of life and working ability.

Prevention: Choose breeders who OFA-certify both parents' hips with Good or Excellent ratings. Maintain lean body condition throughout life — even a few extra pounds increase joint stress. Avoid repetitive high-impact activities like disc dog or agility jumping before growth plates close at 12-15 months. Supplement with glucosamine and omega-3 fatty acids from adulthood onward.

Symptoms: bunny-hopping gait during running, stiffness after rest or exercise, reluctance to jump or climb stairs, decreased willingness to work or train, audible clicking from hip joint

Idiopathic epilepsy is the most common neurological disorder in Border Collies, characterized by recurrent seizures without an identifiable structural cause. The condition has a hereditary component, though the exact genetics are complex and not fully mapped. Seizures typically first appear between one and five years of age and range from mild focal seizures to severe generalized tonic-clonic episodes. While not curable, epilepsy is usually manageable with anti-seizure medication, allowing most affected dogs to live normal, active lives with proper veterinary oversight.

Prevention: Epilepsy cannot be prevented through management, but responsible breeding reduces incidence — avoid breeding dogs with epilepsy or those who have produced epileptic offspring. Keeping a seizure diary helps veterinarians optimize medication. Minimize known seizure triggers including stress, sleep deprivation, and overheating. Regular anti-seizure medication blood level monitoring ensures therapeutic dosing.

Symptoms: sudden collapse with rigid limbs and paddling, loss of consciousness during episodes, drooling, urination, or defecation during seizure, pre-seizure restlessness or clinginess (aura phase), post-seizure disorientation and temporary blindness, brief staring episodes or fly-snapping (focal seizures)

Progressive Retinal Atrophy is a group of inherited degenerative eye diseases that cause the photoreceptor cells in the retina to deteriorate over time, eventually leading to blindness. In Border Collies, the condition typically begins with night blindness and progressively worsens over months to years. Affected dogs adapt remarkably well using their other senses, especially when vision loss is gradual and the home environment remains consistent. DNA testing is available for the breed-specific mutation and has significantly reduced incidence in well-bred lines.

Prevention: PRA is genetically inherited and cannot be prevented through management. DNA testing both parents before breeding is the most effective prevention strategy — carriers should only be bred to clear dogs. Annual ophthalmologic examinations (CAER) help detect early retinal changes. Antioxidant supplementation may slow progression, though evidence is limited.

Symptoms: reluctance to move in dim lighting or at night, bumping into objects in low light, dilated pupils even in bright light, increased eye shine or reflectivity, progressive vision loss over months to years