It depends on the personality or health I'm sure...
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Usually by age 1.
A female Labrador can go into heat as earlier as 6 months of age. However, usually it is around the 8 month range.
My vet said age three. Although my three year, three month old black lab still acts like a puppy. Maybe a bit more mellow, but still joyful & playful.
That all depends on the age, size and temperament of either dog. Typically, a dog with a more nervous energy is one that is more prone to losing than one that is more dominant, because in the dog world, such energy is weak energy, no matter what size or age either dog is.
The average age for any dog to be altered is 6 months--but can be done when the balls drop.
when it gets to the age of 1 or weighs the same as an adult dog
Yes, almost 13 years is a very good age for any dog!
An English Labrador Retriever is typically considered fully grown by around 2 years of age. While they may reach their adult height and weight by 12 to 18 months, they continue to develop muscle and maturity until they are about 2 years old. Individual growth can vary, so some may take slightly longer to fully mature.
A Labrador becomes an adult at approximately 2 years of age.
Labrador retrievers typically start getting gray hair around 7-10 years old, but this can vary based on genetics and overall health. Just like humans, some dogs may show signs of graying earlier or later in life.
Labrador Retrievers were bred to retrieve from mainly the water, Golden Retrievers were bred to retrieve mainly upland birds. Personality wise, the Golden is typically calmer sooner, usually by about 1 year verses the Labrador which will typically be hyper until 2-3 years of age.