A. Male puppies will display mounting behavior at a very young age (3-4 weeks), but are not producing sperm. This puppy mounting behavior will often disappear in a short time and then reappear as the dog approaches puberty.. Male puppies will display mounting behavior at a very young age (3-4 weeks), but are not producing sperm. This puppy mounting behavior will often disappear in a short time and then reappear as the dog approaches puberty.
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