What Is the PSI Strength of a Dog's Bite?

The average strength of a dog bite is 320 to 325 PSI, or pounds per square inch. The actual strength varies from one breed to another and from one dog to another. Pit bulls have a PSI of 235, German shepherds have a PSI of 238 and Rottweilers have a PSI of 328.

There are some reports that mastiffs might have a bite force of 500 PSI, according to Paw Nation; however, the Rottweiler bite of 328 PSI is reported to be the most powerful bite, according to information published on Real Pit Bull based on a study by a National Geographic doctor.