Many factors influence how strong a dog’s bite force is. These include genetics, diet, exercise, age, breed, and size. In general, larger breeds tend to have stronger jaws because they need more power to chew food. They also need more energy to run around chasing after prey. Smaller breeds like Chihuahuas have smaller mouths which require less energy to chew. Their jaws are also weaker as a result. However, there are exceptions to every rule. Some small breeds like Maltese have extremely powerful jaws.