Playa P'z asked in PetsDogs · 1 decade ago

what breed of dogs have locking jaws?

do mix's have stronger jaws then pedigree dogs aswell

14 Answers

  • 1 decade ago
    Best Answer

    There is no such thing as a 'lock jaw'.

    No, not with any dog. Most commonly though, people think pit bulls have locking jaws. This is, however, false.

    "Pit Bulls have locking jaws. NO! The pit bulls jaws are the same as any other breed of dog! Any Veterinarian can verify this is simply a myth. Pit Bulls have been bred to not let go, however, their jaws are not locked.

    Prepared by:

    Al W. Stinson, D.V.M.

    Director of Legislative Affairs, Michigan Association for Pure Bred Dogs, and the Michigan Hunting Dog Federation, and a Member of the Board of Directors of the American Dog Owners Association

    The following quote was sent to me from Dr. Howard Evans, Professor Emeritus, College of Veterinary Medicine at Cornell University, Ithaca New York. We were colleagues in the veterinary college for four years. He is the author of the textbook, ANATOMY OF THE DOG, (the world's definitive work on the anatomy of the dog). His statement was in a letter addressed to me on March 26. 2002. His quote was: "I have spoken with [Dr.] Sandy deLahunta (the foremost dog neurologist in the country) and [DR.] Katherine Houpt (a leading dog behaviorist) about a jaw locking mechanism in pit bulls or any other dog and they both say, as do I, that there is NO SUCH THING AS "JAW LOCKING IN ANY BREED.

    We all agree that the power of the bite is proportional to the size of the jaws and the jaw muscles. There is no anatomical structure that could be a locking mechanism in any dog." As a Professor Emeritus from the College of Veterinary Medicine at Michigan State University, I agree completely with their conclusion.

    Pit Bulls have a 1800 PSI Jaw Pressure. Wrong again. Working with author Karen Delise (Fatal Dog Attacks) we have researched the references used for this data and have found there is no factual research to support this claim. This myth stems from an article published in the 1989 The Journal of Trauma "Mauling by Pit bull Terriers: A Case Report" by Bret R. Baack, M.D., John O. Kucan, M.D., Gerland Demarest, M.D and E. Clyde Smoot, M.D. On Page 519 it states: "Pit Bulls bite with greater force than most dogs (up to 1,800lb/in2) (4).

    Reference (4) cited for this fact is: "Dog bites in children: Epidemiology, microbiology, and penicillin prophylactic Therapy but Douglas A. Boenning, M.D., Gary R. Fleisher, M.D., and Joesph M. Campos, PhD.

    However, neither the topic of bite pressure nor pit bulls is addressed or even mentioned throughout the entire article.

    This case report is promoted by many people as fact, yet it's not substantiated anywhere.

    On the other hand, here is scientific evidence proving this myth is an urban legend:

    Dr. Brady Barr of National Geographic (Dangerous Encounters: Bite Force, 8pm est 8/18/2005) – Dr. Barr measured bite forces of many different creatures. Domestic dogs were included in the test.

    Here are the results of all of the animals tested:

    Humans: 120 pounds of bite pressure

    Domestic dogs: 320 LBS of pressure on avg. A German Shepard, American Pit Bull Terrier (APBT) and Rottweiler were tested using a bite sleeve equipped with a specialized computer instrument. The APBT had the least amount of pressure of the 3 dogs tested.

    Wild dogs: 310 lbs

    Lions: 600 lbs

    White sharks: 600 lbs

    Hyenas: 1000 lbs

    Snapping turtles: 1000 lbs

    Crocodiles: 2500 lbs"

  • 3 years ago

    Locking Jaw Dogs

  • 1 decade ago


    A dog's jaws are all the same.. the muscle and bone structure is the same for all breeds.. the only difference is some were bred to have an underbite.. but even then the mechanics of the jaw work the same.

    Some breeds like pits were bred to bite and hold on, while other breeds bite and release repeatedly.. but none of them "lock". Dogs of similar size will have approx the same PSI in their bite.

  • Anonymous
    1 decade ago

    Common myth (especially when it comes to pit bulls), but no dog has locking jaws. X-rays reveal that dogs all have the same basic jaw structure and none of them have a 'locking mechanism' of any kind built in.

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  • Trish
    Lv 5
    1 decade ago

    It is a misnomer that pit bulls have locking jaws.

    None of them have locking jaws, not to mention that when they did psi tests on bites pit bulls were not even the highest.

    Why are you so obsessed with having a dog that can bite hard or have a locking jaw?

  • Anonymous
    1 decade ago






    Get the point? No breed of dog has locking jaws. And no. The average bite psi for dogs all around is between 120-130 I believe.

  • 1 decade ago

    no dogs have locking jaws an its a myth about pitbulls.

  • 1 decade ago

    none have locking jaws

  • Anonymous
    1 decade ago

    none have locking jaws.

  • Socion
    Lv 6
    1 decade ago

    The ones with keys around their necks!

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