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?
Litters, weights, buyers & health records — synced on every device, from puppies to pedigrees.
Brun d'Or Litter — Week 2
7 puppies · Updated just now
🗓 Whelping window estimate
↑ Open the live Weight Tracker — export its history to the App later.
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
The free tools answer today's question. The guides explain the why. The app runs the whole operation when you're ready.
Use the free tools
Run whelping dates, progesterone timing, and litter costs in seconds — no signup, on any device.
Browse the tools →Learn from the guides
62 vet-informed articles and 109 breed profiles back every number with the why.
Open the guides →The app takes over
When one-off calculations become a real program, export your Weight Tracker history into BreedTools App — no re-entry.
Run your whole breeding program like a pro
Trade the whelping-box notebook, the scattered spreadsheets, and the group chats for breeding software that runs the whole operation — litters, whelping, buyers, contracts, stud pages, and show titles, synced across every device.
Your weight history comes with you
Already weighing a litter? Import that full history straight into the app — no re-entry.
Breeder Education
Guides built for breeders
Evidence-based guidance on pregnancy, whelping, neonatal care, and breeding decisions — written by breeders, for breeders.
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
Honest, research-backed guides — browse by size, or jump to a popular 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
Every new account gets 30 days of full Breeder access — litters, buyers, contracts, and finances, all synced. Keep the free plan after if you like.
30 days of everything · no credit card · keep your free plan & data either way