Lockjaw is a serious medical condition caused by the bacteria *Clostridium tetani*, which can lead to muscle spasms and paralysis. It is not a breed-specific condition.
Pugs, however, are known for having brachycephalic syndrome, which is a condition caused by their short, flat faces. This can lead to breathing difficulties and snoring.
While pugs may have breathing problems, this is not related to lockjaw.