Free Breeding Planner

Some breeds cycle on a shorter interval than the canine average. German Shepherd Dogs, Rottweilers, Dobermans, and Boxers commonly cycle every 4 to 5 months (roughly 130 to 180 days) rather than the textbook 6 to 7 months. This is well-documented in the reproductive literature (Concannon 2011 is the standard reference). The free planner on this page uses a generalized 210-day cycle for all dogs because it only has a single date to work from. Inside BreederHQ, projections refine from each individual girl's recorded cycle history, so a Shepherd who has cycled at 140, 145, and 138 days projects forward at her actual interval, not a species default.

A handful of dog breeds cycle once a year rather than twice. Basenjis, Norwegian Elkhounds, Pharaoh Hounds, Finnish Spitz, and Tibetan Mastiffs are the most commonly cited annual cyclers, and most of them are photoperiod-sensitive (cycles cluster in the autumn). The free planner does not model this. If you breed one of these and project forward at 210 days, the math will be wrong by months. The breed-specific cycle ranges section below has the documented intervals BreederHQ uses for these breeds in-platform.

No. This tool is intentionally simple: one species default, one date in, projection out. It is meant for a fast look at the next 12 months across up to 3 animals, not breed-precise planning. Breed-aware cycle ranges, photoperiod modelling, and per-animal pattern learning live inside BreederHQ's heat-cycle records, where you can log actual cycle starts over time and the projections refine themselves.

Two ways. First, the platform carries a documented cycle-interval range for breeds that materially differ from the species default (the breeds listed in this page's breed-specific section, plus seasonal flags for photoperiod-sensitive breeds). Second, once you have recorded two or more heat starts for an individual girl, projections shift to her own pattern rather than the breed default. A Boxer who actually cycles at 165 days projects at 165, not 150. This matters most for stud bookings, semen orders, vet scheduling, and waitlist commitments, where being off by a month is a real operational problem.

Both, depending on the breed. The short-interval cyclers (German Shepherd, Rottweiler, Doberman, Boxer) and the photoperiod-sensitive annual cyclers (Basenji, Norwegian Elkhound, Pharaoh Hound, Finnish Spitz, Tibetan Mastiff) appear in peer-reviewed reproductive literature, most prominently Concannon's 2011 review of canine reproductive biology, with more recent work on Basenjis published in Nature Scientific Reports in 2025. Some other breeds (Rhodesian Ridgeback is one example) are documented primarily through clinical observation and breed-club reproductive health references rather than controlled studies. Where the evidence is clinical rather than experimental, BreederHQ flags it as such.