Newsround interviewed vet Tricia Mundy from the Village Animal Hospital in Surrey, who gave us some top tips for avoiding dangerous dogs.
Here's what you should do if you fear a dog might be about to attack you.
- Stand still
- Stay calm
- Face the dog
- Fold your arms
- Walk away calmly, facing the dog, but without making eye contact
And remember, if a dog attacks a human, it's usually not because it is trying to "hunt".
Tricia said it's often because the animal feels frightened, so dogs are usually more scared of us than we are of them.