When does a Labrador go into heat?
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Labradors generally begin to go into heat at 6-8 months of age, which indicates they have reached sexual maturity. However, a Labrador reaches sexual maturity earlier than physical maturity.
It is best to wait until the Labrador’s body is fully developed before breeding, so mating during the first heat is generally not recommended even though sexual maturity has been reached, because the other bodily systems are not yet fully developed.