youngc1@gao.gov. American Samoa is a U.S. insular area that operates its customs and immigration programs according to its own laws and independent of the United States. As such, U.S. agencies, such as U.S. Customs and Border Protection, have no roles in operating the customs or immigration programs in American Samoa.
Quick Answer. A female dog goes into heat again between 4 and 6 months of having her puppies. The non-spayed dog goes into heat twice a year, and this is known as estrus. The estrus cycle lasts between 12 and 21 days but often varies between breeds and dog size.
Generally the dog comes into heat, and the experienced breeder notices right away, while the newbie may not notice till day four. Normally they are breedable on approximately day 12 to day 18, but they can remain in heat till day 21. Each dog is different, and heat averages two to three weeks.