Well, you made it. A year ago, you brought home a tiny, chaotic bundle of energy who chewed your shoes, woke you up at 3 am, and somehow still managed to steal your heart completely. Now, here you are, the proud owner of an almost-grown-up frenchie!

Over the past 11 months, we've covered a lot of ground, including toilet training, parasites, nutrition, grooming, socialisation, and everything in between. This final blog in the series is all about what happens next. There's still plenty to think about as your French Bulldog transitions from puppyhood to an adult.

Here’s a simple, practical guide to what to expect and how to support your dog at this exciting age.

When does my French Bulldog puppy become an adult dog?

There are different aspects to a puppy’s development, but here, we use the term “adult” to mean physical maturity (having a fully developed skeleton, organs and muscles). Emotional and cognitive (cerebral) maturity takes a little longer.

In French bulldogs, the skeleton is fully developed between 10 and 12 months. Sexual maturity is also reached around the same age. Because of this, we usually consider a Frenchie to be an adult from 12 months of age. 

The muscle mass and body proportions may still continue to change until 14-18 months of age, especially in entire male dogs. 

When should I switch my French Bulldog from puppy to adult food?

When your Frenchie reaches adulthood, it’s time to transition from puppy to adult food. Puppy food is specially formulated with higher calories and extra minerals to support growth. Once your dog is fully grown, these are no longer needed and will lead to weight gain, which is usually a concern with French Bulldogs.

It’s important to switch gradually, as sudden changes can upset your dog’s tummy:

• Days 1–3: 75% puppy food, 25% adult food

• Days 4–6: 50/50 mix

• Days 7–9: 25% puppy food, 75% adult food

• Day 10 onwards: 100% adult food

Vet tip: Keep a close eye on your dog’s weight and body condition during the transition and afterwards. You may need to adjust portion sizes slightly.

If you’re unsure when to start the switch or which adult food is best for your dog, our online vets are here to help.

Should I book a vet check-up for my French Bulldog?

This is a perfect time for a check-up with your vet, especially if they haven’t been seen since their puppy vaccinations. Even if they seem healthy, regular vet visits are one of the most valuable ways to keep your dog well. 

Routine visits help your vet understand what’s normal for your dog, so that it’s easier to spot subtle changes down the line. They’re also an opportunity to discuss any changes you may have noticed or ask any questions you may have. 

For French Bulldogs, routine check-ups are particularly valuable for monitoring:

• Weight and body condition

• Ear and skin health, early signs of allergies

• Breathing, especially for BOAS

Behaviour, training and life skills

Dogs continue developing mentally well into their second year, and without continued stimulation and reinforcement, behaviours can start to slip. A well-exercised brain is just as important as a well-exercised body! Boredom or frustration can lead to anxiety. 

Social maturity starts around this age. This means dogs can push boundaries, and you might notice a regression in their behaviour and training. For example, being more distracted on walks, and not listening. Going back to basics with training can help. Practising basic commands such as sit, stay, and recall with high-value treats can help.

Keep their minds engaged:

• Continue gentle, positive exposure to new environments (vet visits and grooming) and people. You might notice your Frenchie becomes more selective with who they want to be friends with.

• Consider a dog sport or activity, like agility training. As long as we’re careful about their breathing and risk of overheating, agility training can be a lot of fun for a young Frenchie and can be a way to help them stay fit. 

• Keep regular training sessions going, and reinforce basic commands. Your Frenchie's attention span should be better at this age, but they will also be more independent. 

• Continue using lick mats, puzzle toys and other mental enrichment games.

Exercise and sleep needs

At this age, most dogs are ready for more exercise, but it’s important to be careful, as they can still be prone to injuries. Activities like long walks and scent work are great ways to keep your dog fit and build muscle while maintaining a healthy body condition. But have a chat with your vet before you tackle more intense forms of exercise, to make sure these are appropriate for your Frenchie.  

Sleep is just as important at this stage. Most adult Frenchies need around 12 to 14 hours of rest each day, though this can vary depending on how active they are. A well-rested dog is a happy, healthy dog!

Insurance and microchipping

If you haven't already, make sure your dog is microchipped. This is a legal requirement in the UK and many other countries, and it’s a vital safety net if they ever go missing. Make sure that your contact details on the microchip database are up to date.

Now is also a good moment to review your pet insurance policy. Make sure you have the right level of cover, particularly for the conditions French Bulldogs are prone to, such as intervertebral disc disease and allergies.

Your 12-Month Puppy Checklist

• Book an annual health check with your vet

• Don’t forget the parasite preventatives - especially fleas, ticks and worms

• Plan the puppy to adult food switch

• Discuss neutering if not done yet

• Continue daily teeth brushing

• Check paws, ears, eyes and skin (especially skin folds) daily for any abnormalities

• Keep up regular exercise and mental enrichment

• Make sure they are getting enough rest

A note from our vets to you

Getting a French Bulldog through their first year is no small feat. You've navigated sleepless nights, chewed furniture, vet trips, vaccinations, training classes, and about a thousand questions about what is normal and what isn’t. You should feel genuinely proud.

The bond you build with your puppy in the first year lays the groundwork for everything that follows. Dogs that are well socialised, trained, properly fed, and regularly checked by a vet are more likely to lead happy, healthy lives and become well-adjusted companions for their families.

Here's to many more years together.