Reproductive Education
Breeding Timing and Progesterone Testing
This page is written for breeders who want clearer timing and fewer missed windows. The biggest outcomes are in timing and semen quality.
Location: Salado, Texas. We are happy to discuss stud availability and breeder education. This page is educational and not veterinary diagnosis or treatment.
Quick Clarity
- Step 1: start progesterone testing early enough to trend
- Step 2: identify LH surge and ovulation range
- Step 3: breed in the fertilizable window
- Step 4: use observation to support the data
Progesterone Machines, Why The Numbers Don’t Match
Two common systems you will see are IDEXX Catalyst (common in vet offices) and Wondfo Pro DX / PETlife (common with breeders). These analyzers can use different calibration and reference guidance, which is why trending over time matters.
Early heat
Baseline territory. Usually too early to plan breeding, keep tracking and retest as heat progresses.
LH surge window
Fertile window is approaching. This is where many breeders tighten testing to every 1–2 days.
Ovulation range
Ovulation occurs in this zone. Best breeding is often later than ovulation.
Breeding day 1
First breeding day, based on the fertilizable window and method.
Breeding day 2
Second breeding day for better coverage. We keep it to one or two total breedings.
Important: Educational information only. Individual females vary. Use serial progesterone testing, observation, and veterinary guidance for medical decisions.
Progesterone “Stalls”, What They Mean and What To Do
One of the most common timing headaches is a stall, where progesterone stops rising the way you expect, or it creeps up so slowly that you feel stuck. Stalls happen, they do not automatically mean something is wrong, but they do change how you plan.
What a stall looks like
- Progesterone sits in the same range for multiple tests (example: 2.2, then 2.4, then 2.3)
- Very slow climb over several days (example: 1.6, 1.9, 2.1, 2.3)
- Behavior and discharge suggest heat, but numbers are not moving yet
Why stalls happen
- Normal variation: some females just climb slower
- Testing timing: you can miss the jump if you test too far apart
- Cycle pattern differences: split heats and irregular cycles happen
- Measurement noise: small swings can be normal variance at low numbers
What to do when you suspect a stall
- Shorten your testing interval. Move to every 24 hours until you see movement.
- Stay consistent with the analyzer. Avoid switching between IDEXX and Wondfo mid-cycle if possible.
- Cross-check with observation. Flagging, discharge change, and standing heat can help confirm where she is.
- Consider cytology with your vet if the stall is prolonged or the female has a history of irregular heats.
- Do not schedule breedings off calendar days. In a stall cycle, calendar timing can burn you.
A simple stall rule
If she is stalled below LH surge range, keep testing and do not panic. If she is hovering around LH surge range, test daily because the jump can happen fast. If she is near ovulation range and stalled, tighten testing and consider professional support, because the window can be tight and easy to miss.
Educational note: when in doubt, trend more frequently rather than guessing. Missed timing happens most often when testing is too spaced out.
Disclaimer: Educational information only. For medical concerns, fertility problems, or abnormal cycles, consult your veterinarian.
What Else To Watch Besides Progesterone
Progesterone is the strongest signal, but consistent breeders use observation to support the data.
- Bleeding amount and color shift (often lighter or watery later)
- Flagging and standing behavior
- Behavior change and interest in males
- Vulvar swelling shifts and softening
- Vaginal cytology or vet exam if you are uncertain
Timing Tips That Move Results
- Trend beats one number: the rise and pattern matters
- Test more often as you approach the window: many breeders move to every 1–2 days
- Two breedings can cover the window: better coverage than one, without overdoing it
- Semen quality changes everything: lower motility tightens timing
What Matters Most About Breeding
If you only remember one thing, remember this: progesterone testing is the backbone of timing. Calendar days can be misleading, and visual signs alone can be inconsistent.
Simple process
- Start testing early enough to establish a trend
- Identify the LH surge range on your machine
- Confirm the rise into ovulation and then fertilizable period
- Plan one or two breedings based on your method and trend
Why “Later” Often Works Better
Dogs ovulate immature eggs. Those eggs generally need time to mature before they are fertilizable. That is why breeders often see better outcomes when breeding aligns with the fertilizable window rather than ovulation day.
This does not mean wait blindly. It means use progesterone trends to stop guessing.
Interested In Using One Of Our Studs?
Reach out early in the heat cycle. If you have progesterone results, include the dates and values, plus the machine used (IDEXX or Wondfo).
Salado, Texas. Educational information only. For diagnosis or medical decisions, consult your veterinarian.
FAQ
Do you offer natural ties?
No. We focus on education and timing strategy, plus stud availability discussions.
Do you do three breeding days?
No. Our approach is one or two breedings total, based on timing, trend, and semen plan.
Will supplements increase litter size?
Supplements can help when there is a deficiency, but timing, ovulation count, semen quality, and embryo survival are usually the bigger drivers of litter outcomes.
Disclaimer: Educational information only. Not veterinary advice. Consult a veterinarian for medical decisions or high-risk cases.