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Today some vets will spay/neuter at eight weeks of age, while other adhere to the old practice of six months of age. The average age at which pets are spayed or neutered is four months. Adolescent cats and dogs as young as five months can get pregnant.
Quick Answer. Female dogs experience their first reproductive cycle, or heat, when they are between six months and two years old, explains WebVet. The female dog can become pregnant during her first heat. Whitney Veterinary Hospital recommends letting a dog go through at least one heat before becoming pregnant.