<p>Hi there,</p>
<p>Domestic dogs usually come into heat sometime between 8-12 months, although some dogs have delayed up to 18 months. If she doesn't have her first heat period by 20 months, then consult a vet. </p>
<p>Do you plan to breed her? If she is not registered then I would advise you to spay her immediately. I work at a shelter, and owners who just “meant well” drop of far too many puppies on a daily basis. Besides, if she looks like a pit, and you don’t have papers, the only people most likely interested in her pups would be those same people interested in dog fighting or just want a pit to make them look cool, and macho. Do you really want her pups to end up in that kind of life? </p>
<p>Be blessed,</p>
<p>Arlene, All In One Pet Care </p>