Is your Frenchie in heat for the first time? Here is how long a heat cycle lasts, what to expect, and how to keep her safe and comfortable.
When will my Frenchie have her first heat?
Timing varies widely between individual dogs. Small and medium breeds often have their first heat sometime during their first year, but some are earlier or later. Ask your vet what to expect for your dog, and note the date when it happens. After the first cycle, Merck notes the interval between cycles "can range from 4 to 13 months," with an average of 7 months.[1]
The stages of a heat cycle
| Stage | Typical length | What happens |
|---|---|---|
| Proestrus | About 9 days (2 days to 3 weeks) | Swollen vulva, bloody discharge. Males are attracted, but she usually refuses them. |
| Estrus | About 9 days (3 days to 3 weeks) | Fertile period. Discharge often turns lighter. She may accept a male. |
| Diestrus | About 2 months | Hormone levels stay high whether or not she is pregnant. |
| Anestrus | Several months | Resting phase until the next cycle. |
Proestrus and estrus lengths are from the Merck Veterinary Manual.[1]
Signs she is in heat
- Swollen vulva
- Bloody or pink discharge (some dogs keep themselves very clean, so it can be easy to miss)
- Licking the genital area more often
- Peeing more often or marking
- Restlessness, clinginess or mood changes
- Male dogs suddenly very interested in her
Caring for her during heat
- Supervise every moment outside. Never leave her alone in a yard. Males can jump or dig under fences.
- Walk on a leash only, and avoid dog parks.
- Use washable dog diapers or heat pants indoors if you like. Remove them for potty breaks and keep the area clean and dry.
- Offer comfort and calm. Extra cuddles, chew toys and quiet time help.
- Keep exercise gentle, as always for a Frenchie.
If an accidental mating happens, call your vet promptly to discuss options. Because French Bulldogs often need cesarean sections, an unplanned pregnancy carries real risk.[2]
Warning signs after heat
Call your vet promptly if, in the weeks after a heat, she:
- Drinks and pees much more than usual
- Has pus-like or foul-smelling discharge
- Seems tired, vomits or loses her appetite
- Has a swollen belly
These can be signs of pyometra, a serious uterine infection in unspayed females that needs urgent treatment.
Spaying: questions to ask your vet
The best age to spay depends on your dog's size, health and lifestyle, and guidance has changed over time. Ask your vet:
- "What age do you recommend for spaying a French Bulldog, and why?"
- "Should we wait until after her first heat?"
- "How do you manage anesthesia in a flat-faced breed?"
- "Can her airway be checked, or treated, during the same anesthesia?"
Related French Bulldog guides
- Pregnant French Bulldog Care: Week by Week
- French Bulldog Puppy Health Checklist: What to Check Before You Buy
Sources and references
- Davidson AP. Management of Reproduction in Dogs [Internet]. Merck Veterinary Manual; 2018 Jun [updated 2026 Jun; cited 2026 Nov 3].
- O'Neill DG, Packer RMA, Francis P, Church DB, Brodbelt DC, Pegram C. French Bulldogs differ to other dogs in the UK in propensity for many common disorders: a VetCompass study. Canine Medicine and Genetics. 2021;8(1):13. doi:10.1186/s40575-021-00112-3.
Last reviewed November 3, 2026. Educational information only. This guide does not replace advice from your veterinarian.