Border Collie Age Calculator
Calculate your Border Collie’s age in human years and get personalised health, nutrition, and life stage information.
Border Collie Health Conditions#
Collie Eye Anomaly
moderateModerateInherited choroidal/retinal developmental defect caused by NHEJ1 gene mutation. Present from birth. Severity ranges from mild with no vision impact to colobomas and retinal detachment. DNA test available for breeding decisions.
Prevention: DNA test. CAER exam.
Symptoms: usually mild
Trapped Neutrophil Syndrome (TNS)
life_threateningUncommonAutosomal recessive inherited immune disorder specific to Border Collies. Bone marrow produces neutrophils but cannot release them into bloodstream, causing fatal immunodeficiency. Usually fatal by 4 months. DNA test available for carrier detection.
Prevention: DNA test available. Breed from tested parents.
Symptoms: chronic infections, failure to thrive
Hip Dysplasia
seriousCommon~12% affected per OFA.
Prevention: OFA screening. Maintain healthy weight.
Symptoms: difficulty rising, hind limb lameness, bunny-hopping
Epilepsy
seriousCommonIdiopathic epilepsy is one of the most common health issues in Border Collies, with suspected polygenic inheritance. Onset typically between 1-5 years. Seizures vary from focal to generalized tonic-clonic. Most dogs respond well to anticonvulsant therapy.
Prevention: Not preventable. Managed with medication.
Symptoms: seizures
Border Collie Growth Chart#
| Age | Weight Range | Notes |
|---|---|---|
| 2 months | 4.5–9 lbs | Early growth phase |
| 4 months | 10.5–20.2 lbs | About 40% of adult weight |
| 6 months | 16.5–29.2 lbs | About 60% of adult weight |
| 9 months | 22.5–36.9 lbs | Nearing adult height |
| 1 year | 25.5–41.4 lbs | Near adult size |
| 1.5 years | 28.5–44.1 lbs | Approaching maturity |
| 2 years | 30–45 lbs | Full adult weight |
Healthy adult males 30-45 lbs. Maintain lean body condition.
Border Collie Life Stages#
puppy
0mo – 6moActive Border Collie puppies. Critical development and socialization phase.
adolescent
6mo – 1yrBorder Collie adolescents testing independence. Consistent training important.
young adult
1yr – 2.5yrBorder Collie reaches physical maturity. Energy remains high but focus improves.
adult
2.5yr – 6yrPrime adult years for Border Collie. Maintain health and activity level.
mature adult
6yr – 8yrBeginning to slow. May show graying.
senior
8yr – 11yrSenior Border Collie may show age-related changes. Monitor breed-specific health concerns.
geriatric
11yr – end of lifeFocus on comfort and quality of life.
Dental Milestones#
Border Collies have moderate dental disease risk. Regular brushing recommended. Their high intelligence and trainability makes dental care one of the easier grooming tasks. Natural chewing behavior helps maintain tooth health.