Article: Spaying and "reactivity".(german shepherds)(Brief article)

Owners of German shepherds are not imagining things. Females of that breed really do appear more aggressive after they're spayed. Hormonal changes probably are to blame, said researchers reporting on "effects of ovariohysterectomy on reactivity in German shepherd dogs" in The Veterinary Journal (Vol. 172, No. 1). The six researchers (including DogWatch columnist and behavior expert Dr. Katherine a. Houpt) conducted the experiment with young German shepherds at the Korean air Force Dog Training Center.

Behavior tests commenced four to five months after the spaying operations, when the animals were fully healed, and spayed dogs were compared to sexually intact ...

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