Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

My dog had lockjaw, but it resolved. What caused this episode?

Updated on September 23rd, 2025

Pet's info: Dog | American Pit Bull Terrier | Male

Last night I left neno for 20 mins in my room when I came back it was like he had lockjaw. I couldn't get his mouth open. For 3 hours it was like that then my son opened his mouth and it was like it was fixed. Hes fine now. Why did that happen?

1 Answer

Most Helpful Answer

Daniela Jessen, DVM

Answered By Daniela Jessen, DVM

Veterinarian

Published on December 30th, 2018

Trismus is the medical term for the condition more commonly called “lockjaw.” It is actually spasms of the chewing muscles which make it hard to open the mouth.
A common cause for trismus in dogs is a condition called masticatory muscles myositis (MMM), or inflammation of the muscles of mastication (chewing). The inflammation is caused by an immune mediated attack on the muscles, leading to trismus and wasting away of the muscles at the top of the affected dog’s head. Trismus can also be caused by trauma or conditions such as fractures, dislocation, and arthritis in the temporomandibular joint (TMJ), which is the joint where the upper and lower jaws connect.
I would recommend to take the dog to be checked by a vet and please if another episode of 'lockjaw' happens video the episode to show the vet.
Vote Icon1Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share

Styled arrow button