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.
If your puppy goes into heat, then you know that she is indeed old enough to get pregnant, whether she's 5 months or more than a year in age. The heat cycle usually happens twice annually in dogs. When your puppy is in heat, she'll probably give a lot of indications of it to clue you in.