Dog season calculator
Most dogs come into season every 6 to 7 months, about twice a year. Each season lasts roughly 2 to 4 weeks.
- Could start from
- Tue, 20 Apr 2027
- Usually by
- Thu, 20 May 2027
- This season should end by
- Tue, 17 Nov 2026
- The one after that
- Sat, 20 Nov 2027
Based on a season starting on the date you entered and a cycle of about 6.5 months. Every dog is different, so keep a diary of her seasons.
A guide only. Seasons can be irregular, especially the first few. Talk to your vet about neutering if you don’t plan to breed.
Dog seasons at a glance
| Question | Typical answer |
|---|---|
| First season | Around 6 months old, but can be as late as 2½ years. Small dogs often start earlier. |
| How often | Every 6 to 7 months, about twice a year |
| How long it lasts | About 2 to 4 weeks |
| Bleeding | Usually about 7 to 10 days |
How we calculate this
The PDSA says most dogs come into season every 6 to 7 months after their first. We add your dog’s cycle to the date her last season started, and show the usual range either side.
Recording the start date of each season builds up her own pattern, which is a better guide than averages.
Questions people ask
How often do dogs come into season?
Usually every 6 to 7 months, so about twice a year, though some breeds and individual dogs differ.
How long does a dog’s season last?
Around 2 to 4 weeks. Bleeding usually lasts about 7 to 10 days, and she can still get pregnant after it stops.
When do dogs have their first season?
Most have their first around 6 months old, but it can be as late as 2½ years. Smaller dogs tend to start earlier than large breeds.
Should I keep her away from male dogs?
Yes, for the whole season, unless you plan to breed. Keep her on a lead on walks and avoid busy dog areas.
Related calculators
- Dog pregnancy calculatorYour dog’s due date, earliest and latest birth dates, and when a vet can confirm it.
- Puppy vaccination calculatorTypical dates for your puppy’s jabs, first walk and first booster.
- Dog age calculatorYour dog’s age in human years, adjusted for their size.
- Dog crate size calculatorWhat size crate your dog needs, from two quick measurements.
- Cat pregnancy calculatorYour cat’s due date from the mating date, and when a vet can confirm pregnancy.
- Cat age calculatorYour cat’s age in human years, using vet guidelines.
Save or share this calculator
Embed this calculator
Free to use on your website, blog or newsletter. Copy this code and paste it into your page.