How Long After Giving Birth Does a Female Dog Go Into Heat?

Exactly when a mother dog goes into heat after birth is hard to determine, but dogs heat twice a year, mainly in spring (March to April) and autumn (September to October), which helps estimate the time. Note that re-conception soon should be avoided; one litter a year is best, since two a year harms her health and lifespan. Therefore schedule mating wisely, and if she comes into heat within months of birth, keep her from opposite-sex dogs.