The free toolkit for
serious dog breeders
breedtools.com
The free breeder toolkit — 43 calculators & trackers, plus breeder guides. No account, free forever, private in your browser.
BreedTools App · breedtools.app
Running a whole program?
Keep your breeding records together in an account that syncs across your devices.
Brun d'Or Litter — Week 2
Example litter · 7 puppies
Example whelping window · 2026
↑ Open the free Weight Tracker to start your own litter.
43 free tools109 breed guides62 articles$0 forever
Free Breeder Tools
The tools breeders actually use
Start here — the calculators breeders open most: whelping dates and heat timing lead the way. Everything is free and runs instantly in your browser.
Whelping Date Calculator
Enter the breeding date for a due-date range, daily pregnancy milestones, and the pre-labor temp-drop alert.
Open the calculator →Progesterone & Breeding Window
Interpret progesterone readings — IDEXX, Finecare, Mini Vidas, Cube Vet — and pinpoint the fertile window.
Open the calculator →How It Fits Together
From a quick calculation to your whole program
Calculate, learn, then bring your weight history with you if you choose the app.
Use the free tools
Get an estimate for today’s breeding or care decision. No signup needed.
Browse the tools →Learn from the guides
62 articles and 109 breed profiles explain timing, care, and planning.
Open the guides →Bring your weight history
Export your free Weight Tracker history, then import it into BreedTools App without re-entering past weights.
From morning weigh-in to go-home day
Weigh the litter, review growth trends, log dam temperatures, and follow up with buyers — all in one place.
A daily litter check-in
Record today’s weights together, then see each puppy’s growth over time.
Breeder Education
Guides built for breeders
Practical guides to pregnancy, whelping, neonatal care, and breeding decisions, with references you can read for yourself.
See the references behind the advice: our pregnancy guide lists its veterinary sources.
Pregnancy & Whelping
Normal gestation ranges, stages of labor, what's considered typical variation, and how to prepare for delivery.
15 articles →Growth & Development
How healthy puppy weight gain progresses, why trends matter more than single readings, and when to be concerned.
6 articles →Heat Cycles & Fertility
Understanding cycle patterns, natural timing variation, and how long-term records improve breeding decisions.
5 articles →109 Breed Profiles
Compare breed traits, health considerations, and care needs — browse by size or choose a breed.
Our Philosophy
Your records never leave your device.
Every free tool on this site runs in your browser — what you enter in them is never sent to a server. The App is different by design: it syncs your records to your own account, across your devices.
- Released when ready
- Free forever — support optional
- Supports your vet, never replaces them
Try the full breeding app free for 30 days
Try the Breeder features for 30 days with no credit card. Then choose a paid plan or keep the free plan and your data.
30 days of everything · no credit card · keep your free plan & data either way