French Bulldog puppies are very friendly and eager to please as result of their nature. Although they are very aggressive with other dogs despite their gentle nature with humans. So you need to take the necessary time in order to properly socialize your French Bulldog puppies with other people and pets. If there is every any aggression towards humans then you need to take your puppy to a professional trainer right away.
If you have a dog that growls or acts aggressively towards strangers, it's not too late to do something about it. But first, you should understand why your dog's acting this way. Your dog's ancestors were aggressive by nature. Living in the wild meant having to hunt for food, and defend themselves from other animals. It was instinct to protect their resources like food, mate and territory.
Fortunately, selective breeding over the centuries has minimized and refined this trait significantly. Even so, it's important to understand that by nature, all dogs are physically capable of inflicting serious harm. One look at those teeth and you know this is true! While aggression is part instinctive, there is much you can do to prevent it from becoming a problem in your dog. If (for some reason) this aggression does surface, there are definite things you can do to deal with the problem.