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.
Starting Heat Cycles. Female dogs go into heat when they are unspayed and reach puberty. The time at which this happens depends on the breed. While the average age at which female dogs go into heat is about 6 months, smaller dogs may enter estrus earlier and larger dogs may not do so until they are nearly 2 years old.