Pit Bulls/Lock jaw


jab wrote at 2006-10-12 20:47:36
contrary to popular belief pitbulls cannot exert even close to 1,000 pounds of pressure but the record for a pit bull is on approx. 235 pounds closely followed by german sheperds putting down approx. 238 ponds and the dominating dog putting out a whopping 328 pounds of pressure is the rottweiler.

jim wrote at 2007-11-06 20:30:56
pitbulls bites are no stronger than any other large dogs bite. where did you get that info? you are misinformed!

motoxtremes19 wrote at 2008-03-22 22:22:49
i am sorry. u are saying a hyena has a 20,000 pound bite?  a saltwater croc has the strongest bite psi and it is only 5000.

motoxtremes19 wrote at 2008-03-22 22:26:12
and to add to the guy jab.  i had my dog bite tested. and he bit at 400 pounds. so they can get up there but not as close as people say.

Crystal wrote at 2008-10-21 05:00:51
No dog has the mechanisms to lock its jaw, pitbulls included. Nor do they have the most powerful jaws. In a test done by National Geographic, an American Pitbull Terrier had less bite pressure than a German Shepard and a Rottweiler. The pitbull had 235lbs of force, the German Shepard had 238lbs and the Rottweiler had 328lbs of force, which is the most bite pressure recorded from any domestic dog. This is a far cry from 20,000lbs, not even a crocodile exerts that much force and they have one of, if not the, strongest jaws in the animal world at 2,500lbs of bite pressure. What makes the difference between the bite of a pitbull and another dog is its willpower to hold on. Furthermore, feeling the need to correct more misleading information, hyenas are related to mongooses, not dogs and have a bite force of 1,000lbs. I hope this gives a more accurate answer.

rich wrote at 2009-02-11 23:53:51
They also have a cap in theater ave so they keep whatever is in there jaw in there they roll kinda like if you would but the tips of you figure together and rub them there jaw structure is different than most dogs there made to hit major arteries

manni wrote at 2009-02-20 20:37:14
no no no no no no no fighting dogd e.g bull territer  staffs pits even rottwliers i think dogo argentino presa canario and other fighting breeds have lock jaw i dnt no why its only them that have it but maybe cause there fighting breeds and i dont no how they got it but they can hold on for long periods of time some up to an hour if there lock jaw is strong  u can hokd up a branch and it will lock it when it has a sweet spot of the object it locks on and they will hold on they done control it you can punch them slap them swing the branch around and they will not come of until there jaw is to tired to grip on any more

psp_16 wrote at 2011-07-16 17:26:41
no such thing as lock jaw in pit bulls there is absolutely no physical aspect within the jaw bone that lock the animals mouth its the fact that pt bulls have extremely strong jaw which exceed about 235 pounds per square inch in their bite this is very strong but not the strongest dog bite nor in the animal kingdom. its a combination of  wide jaw and strong jaw muscles which allow the pit bull to keep its mouth shut for such long periods thus the illusion of a lockedjaw.  

Faith wrote at 2011-09-08 03:57:01
No, pit bulls do NOT have the strongest jaws.


MzTx wrote at 2012-04-21 18:30:55
OMG, I had to stop and Answer this question, because the one before is a COMPLETE LIE!! What are you talking about?? Pit Bulls don't have the strongest Jaws in the dog family- which has been proven by National Geographic Channel.

" Dog Attack Styles"

Mastiff-556 PSI

American BullDog- 305

Dutch Sheperd- 231



" Bite force Test"






Lion- 691

Human: 127

Turtle: 1004


No, Pit Bulls do Not have Locked-Jaw

Egnever Rellik wrote at 2013-03-10 02:54:49
DR. Brady Barr of National Geographic has done a study of the bite psi in 3 dogs.  The Rottweiler finished at the top of the list at with a bite of 328psi.  Next came the German Sheppard at 238psi. Last, with a bite of 235psi, was the American Pit Bull Terrier.  Other studies have been done that show Mastiffs have a bite of a little over 500psi.  A psi of 20,000 is astronomical and absurd for any animal.  Salt water Crocodiles have been considered by many to have the strongest bite at anywhere between 3,000 to 5,000psi depending on which study you follow.  Humans, just as a comparison, have an average bite of around 125-150psi.

Pit Bulls

All Answers

Ask Experts




Size, feeding, excercise, care, shots, aggression, fixing/not fixing, etc... Ask any question. I will try my best to answer.


Raise and care for pitbulls. Have read all sorts of books about pitbulls.

©2016 About.com. All rights reserved.