How Long Until a Border Collie Matures?
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A Border Collie generally matures around 8-10 months of age, entering a slow-growth phase after 10 months, by which time its size is close to that of an adult and will not change much.
The period from 3 to 10 months after birth is the Border Collie’s rapid growth stage; to support normal development, provide enough nutrition during this time to avoid slow growth or other negative effects from poor nutrition.