Like other dogs, Cesky Fouseks reach sexual maturity between six and twelve months of age. Although it may happen as early as four months or as late as eighteen months, the first heat (estrus) cycle of a female Cesky Fouseks often happens during this period. At around the same age as female Cesky Fousek, males start having sexual relations.

Any thought of having a family with Cesky Foueks must take into account the importance of responsible and ethical breeding. Ensuring the utmost importance is placed on health, temperament, and conformity to breed standards. Prioritizing the overall welfare of the dogs involved should always take precedence over breeding for the sole purpose of profit. The best way to breed responsibly is to work with a vet and do things like checkups, genetic testing, and making sure the pups are well-cared for and socialized.

Sexual maturation in Cesky Fousek dogs may occur at a range of ages depending on characteristics including size, breed, and personal growth. Sexual maturation activities, including territory marking, increased vocalization, and wandering inclinations, usually begin between six and twelve months of age. Although male Cesky Foueks may display fertility at any time of year, females typically go into estrus twice yearly.