If you have an unspayed female French Bulldog, her seasons will shape a few weeks of your year. Knowing when to expect one, what’s normal and what isn’t makes the whole thing far less stressful, for both of you.

When will my French Bulldog have her first season?

On average, dogs reach puberty at about six months old, though it varies by breed: smaller breeds tend to cycle earlier, while large and giant breeds may not have a first season until 18 months to two years (VCA Animal Hospitals). As a small breed, a Frenchie is usually toward the earlier end, so a first season around six months is common.

Don’t worry if the first few are erratic. It’s normal for young dogs’ cycles to be irregular, and it can take up to two years for them to settle into a pattern (VCA).

How often, and for how long?

Most dogs come into heat twice a year, although the interval varies between breeds and between individuals, and small breeds may cycle three times a year (VCA). Each heat generally lasts about nine days, but anywhere from 2 to 24 days is possible.

The signs

The changes you’ll notice are:

  • A swollen vulva, usually the first sign.
  • Bloody discharge, which thins to a watery, pink fluid as the season goes on (VCA).
  • More frequent urination and marking, because her urine carries hormones and pheromones that signal to males.
  • Behavior changes. Some dogs get clingy, others grumpy or restless.

Some females keep themselves so clean that owners barely notice a season at all, which is one reason an unplanned litter can catch people out.

When she can get pregnant

She’s fertile for part of the season, not all of it. Ovulation happens around the time the discharge turns watery and pink, and most dogs are receptive to males around the eleventh day, with the best breeding days generally between days ten and fourteen (VCA Animal Hospitals).

Those are averages, not a schedule. Ovulation can happen earlier or later, so if you don’t want puppies, treat the entire season as fertile.

Keeping her comfortable

Dog diapers keep discharge off your floors and furniture, and they need changing regularly to avoid irritating her skin. A Frenchie’s build means diapers designed for dogs without much tail to hold them up tend to fit better. Check the sizing chart against her waist measurement rather than her weight, since a Frenchie is usually broader than the weight band suggests. Two disposable options:

Grooming wipes are useful between changes for keeping her clean and comfortable.

Keeping her safe

A season turns even a homebody into an escape artist, and an intact male can smell a female in heat from a long way off.

  • Supervise every trip outside, even in a fenced yard, and close off a dog door while she’s in season.
  • Walk her on a leash and stay alert to loose dogs.
  • Separate her from intact males in the house. Closed doors or a baby gate work; both dogs will be driven by hormones, and a moment’s lapse is all it takes.
  • Check her ID. Make sure her tag is current and her microchip is registered to your current address and phone number.

When to call your vet

Get in touch with your vet if:

  • the discharge smells foul, or turns to pus
  • bleeding carries on well past three weeks
  • she seems unwell after a season: off her food, lethargic, or drinking and urinating much more than usual

That last group matters most. Pyometra is a uterine infection that can be fatal, and it typically follows a season in an unspayed dog (VCA Animal Hospitals). It’s an emergency, not a wait-and-see.

Also mention it to your vet if she’s reached two years old without a season, so they can check whether something else is going on.

Should you spay her?

If you aren’t breeding, spaying is worth discussing early. The 2019 AAHA canine life stage guidelines suggest that dogs expected to weigh under 45 pounds as adults — which includes French Bulldogs — are generally spayed before their first heat, at around five to six months (AAHA).

The case for it is strong: dogs spayed before their first heat have less than a 0.5% chance of developing mammary cancer, and spaying removes the risk of pyometra and of unwanted litters (VCA). There are trade-offs to weigh too, including urinary incontinence in some older females, and a link with joint problems and certain cancers when large breeds are spayed before they finish growing — less of a concern in a small breed that matures early.

Timing is an individual decision, so make it with your vet. If you bought your Frenchie from a breeder, check your contract as well, since some set terms about spaying.

Thinking about breeding her?

Breeding French Bulldogs is not a casual undertaking. More than 80% of French Bulldog litters are born by caesarean section (Evans and Adams, 2010), which means planned surgery, real cost and real risk to your dog.

Before going any further, talk to your vet, complete the health testing the French Bull Dog Club of America recommends, including hips, eyes, patellas, heart and a BOAS grading, and find an experienced mentor. Our guide to questions to ask a French Bulldog breeder shows what buyers should expect from you.

Frequently asked questions

How long does a French Bulldog stay in heat?

About nine days on average, though a season can run anywhere from 2 to 24 days.

Can she get pregnant during her first season?

Yes. A first season is a fertile season, which is one reason to plan ahead before she reaches six months.

Should she have one litter before being spayed?

There’s no health benefit to it. Spaying before the first heat is associated with the lowest risk of mammary cancer, and breeding this breed carries surgical risk.

How can I tell when she’s most fertile?

You can’t reliably tell by eye. If you’re breeding deliberately, your vet can time it properly with vaginal cytology or progesterone testing.