The free toolkit for
serious dog breeders
Calculators, trackers, and guides built for the way breeders actually work. No signup, no subscription — just open and use.
7 puppies · 15 daily weigh-ins
🗓 Whelping window estimate
↑ Tap to open the live Weight Tracker — a real tool, not a screenshot
Private by design
Your data never leaves your device — no network requests.
free tools, guides & breed profiles
free forever · no signup · no account
Free Breeder Tools
The tools breeders actually use
Start with the calculators breeders open most — progesterone timing and whelping dates lead the way. Everything is free and runs instantly in your browser.
Progesterone & Breeding Window
Interpret progesterone readings — IDEXX, Finecare, Mini Vidas, Cube Vet — and pinpoint the fertile window.
Open the calculator →Most usedWhelping Date Calculator
Enter the breeding date for a due-date range, daily pregnancy milestones, and the pre-labor temp-drop alert.
Open the calculator →Coat Color Genetics
Predict litter coat colors from each parent's genes — Mendelian, with breed examples.
Open →Puppy Growth Chart
Plot litter weights against breed-size curves to catch slow gainers early.
Open →Stud Fee Calculator
Set a fair, defensible stud fee from breed, clearances, titles, and proven status.
Open →Litter Cost Calculator
Total every litter expense and find your break-even price per puppy.
Open →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
59 vet-informed articles and 109 breed profiles back every number with the why.
Open the guides →Ready for a real litter?
When you outgrow one-off calculations, the app ties every dog, litter, weight, and buyer into one running record.
Run your whole breeding program like a pro
Trade the whelping-box notebook, the scattered spreadsheets, and the group chats for one place 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.
14 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.
4 articles →Health & Genetics
Pre-breeding health testing, OFA clearances, DNA panels, and recognizing complications from birth through the neonatal period.
16 articles →Nutrition & Feeding
Feeding the nursing dam, weaning puppies, raw feeding, and food allergies — supporting healthy growth at every stage.
5 articles →Puppy Rearing
Socialization, temperament, buyer screening, go-home prep, and new-owner guides for feeding, vaccines, and fear periods.
14 articles →109 Breed Profiles
Honest, research-backed guides — browse by size, or jump to a popular breed.
Our Philosophy
Built with care, for people who care
BreedTools does fewer things — and does them well. No subscriptions, no data collection, no complexity you don't need.
Your data stays yours
All tracking data is stored locally in your browser. Nothing is sent to any server — ever.
Honest about uncertainty
Tools show ranges and windows, not false precision. Calculators support planning — not replace your vet.
Released when ready
No half-finished features. No misleading beta labels. Every tool ships complete and usable.
Free with optional support
All tools are free, always. Optional support helps fund future development — never required.
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