BonniDune Kennel is located in
Southern Indiana, USA. Although I started
with German Shepherd Dogs, today BonniDune is
dedicated to showing, trialing and producing
sound, versatile Border Collies.
BonniDune is proud to be recognized as an AKC Breeder of Merit.

Puppies Born December 25, 2013

When Is A Border Collie Not A Puppy


Border Collies are known for their intelligence, agility, and high energy levels. They are a popular choice for families and individuals looking for an active and trainable dog. However, determining when a Border Collie is no longer considered a puppy can be subjective and depend on various factors.

Physical Maturity

Border Collies typically reach their physical maturity between 12 and 15 months of age. At this stage, they have developed their full size and weight. Their growth plates have closed, and their bodies have finished developing. This is an important milestone in a Border Collie’s life, as they are no longer considered a growing puppy.

Behavioral Development

While physical maturity is an important factor, a Border Collie’s behavioral development also plays a role in determining when they are no longer considered a puppy. Border Collies are known for their puppy-like energy and playfulness, which can persist well into adulthood. However, as they mature, their behavior starts to stabilize, and they become more focused, calm, and obedient.

Training and Socialization

Training and socialization are crucial aspects of a Border Collie’s development. When a Border Collie is no longer a puppy, they should have undergone basic obedience training and be well-socialized with other dogs and people. This training and socialization help them become well-behaved and adaptable companions.

Health Considerations

Another factor to consider when determining when a Border Collie is no longer a puppy is their health. Puppies require different care and nutrition compared to adult dogs. Once a Border Collie reaches a certain age, their dietary needs may change, and they may transition from puppy food to adult dog food. Regular veterinary check-ups and appropriate vaccinations are also essential for maintaining their health as they age.


While there is no exact age at which a Border Collie is considered no longer a puppy, physical maturity, behavioral development, training, socialization, and health considerations all play a role. It is important to assess these factors to determine when a Border Collie has transitioned from a puppy to an adult dog. Understanding this transition can help owners provide the appropriate care and training required for their Border Collie’s specific life stage.

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