Tetanus, sometimes referred to as "lockjaw," is when your dog's muscles are overreacting to any stimuli, making them tense up and become rigid with muscle spasms. It is caused by infection with the bacteria Clostridium tetani. When C. tetani gets into a wound in your dog's body (or yours, for that matter), it produces the neurotoxin tetanospasmin. This toxin targets the nerves in the area, and can spread to the spinal cord and brain. Any nerves that the toxin binds to overstimulate their associated muscles, causing them to contract over and over again. Dogs with tetanus are uncomfortable and will have trouble walking, and severe cases that impact the muscles of the throat and diaphragm can result in some pretty severe consequences. Can Dogs Get Tetanus? Yes, dogs can get tetanus, but thankfully they are fairly resistant to it. Horses and humans are much more susceptible to this infection. How does a dog get tetanus? The C. tetani bacteria are spread in feces and can survive in the environment for years. They are not harmful if swallowed or if they come in contact with intact, healthy skin. Where things get a little hairy is when C. tetani gets into a wound on your dog, even a small puncture from stepping on a nail or foxtail. Puncture wounds are moist, warm, and have low oxygen exposure—perfect conditions for a bacterial infection. Can Humans Get Tetanus from a Dog Bite? It is possible to get tetanus from a dog bite, but it is very rare. H. Cody Meissner, M.D., FAAP writes for the American Academy of Pediatrics, "Dog bites generally are…