1 Retained by their creators or by archive service providers, such as national or local government archives, university archives, or other archives that collect and maintain archives of other organisations. 2  A great national resource as they document the history and identity of communities throughout the country.
Although six months old is the average age of a dogâs first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat. It is considered best practice to wait until her third heat, at about 18-24 months.
Hi Jenna, Female Dogs go into heat at any time between 6-12 months usually. The average heat cycle for a dog is approximately 3 weeks but for some dogs it is longer and for others it is shorter. Some as short as 10 days and some as long as 4 weeks or more. Usually your dog will go into heat every 6-7 months though again each dog is different and can go back into heat as early as 4 months or not for 12 months.