Tetanus

What Is Tetanus?

Tetanus is an illness caused by a toxin made by Clostridium tetani, a bacterium whose spores live in soil, dust, and animal feces. When spores get into a deep wound with little oxygen, such as a puncture, a bite, a deep cut, or an infected surgical or dental site, they can grow and release a toxin that travels along the nerves. The toxin stops the nervous system from relaxing muscles, so muscles become stiff and go into spasm.

Dogs and cats are much more resistant to tetanus than people or horses, so it is uncommon, and cats are affected less often than dogs. Signs usually appear about 5 to 10 days after the injury, though it can take several weeks, and by then the wound may have healed and been forgotten. Prompt cleaning of wounds, covered in our dog wound care and cat wound care guides, lowers the risk.

Signs Owners Notice

Localized tetanus, which is more common in cats, causes stiffness in just the leg or body area near the wound. Generalized tetanus, more common in dogs, can include:

• A stiff, stilted walk with rigid legs and a raised, stiff tail
• Ears held stiffly upright and a wrinkled forehead
• Lips pulled back in a fixed “grin”
• Difficulty opening the mouth, eating, or swallowing (lockjaw), with drooling
• The third eyelid creeping across the eye
• Muscle spasms triggered by noise, light, or touch
• In severe cases, an inability to stand, trouble breathing, or spasms that can look like seizures

Diagnosis and Treatment

There is no single quick test, so vets diagnose tetanus mainly from the typical signs, especially if there is a recent or healing wound. Blood work and other tests help rule out conditions that can look similar, such as low blood calcium, poisonings, or brain disease.

• Wound care, opening and cleaning the infected site to remove the bacteria
• Antibiotics, such as metronidazole or penicillin, to kill bacteria still making toxin
• Tetanus antitoxin in some cases, which can neutralize toxin that has not yet bound to nerves
• Sedatives and muscle relaxants to control stiffness and spasms
• A dark, quiet room with padded bedding to reduce triggers
• Nursing support, including fluids, a feeding tube if the pet cannot eat, and help urinating and passing stool

Prognosis and Cost Guidance

Localized tetanus usually has a good outlook. Generalized tetanus is more serious, but many dogs survive with intensive care. Improvement often begins within about a week of treatment, and full recovery commonly takes three to four weeks or longer. In the US, mild cases may cost a few hundred dollars, while hospitalization for generalized tetanus can run into the thousands, depending on how long intensive nursing is needed.

Practical Tips for US Pet Owners

• Clean any puncture or bite wound promptly and have deep or dirty wounds checked by a vet.
• Watch your pet closely for stiffness for a few weeks after an injury, dental extraction, or surgery.
• Keep a basic pet first aid kit at home for cleaning minor wounds.
• Find a nearby practice through veterinary clinic listings.

Key Takeaways

• Tetanus is caused by a bacterial toxin that usually enters through a deep wound.
• It causes muscle stiffness, a fixed facial expression, and sometimes lockjaw.
• Treatment combines wound care, antibiotics, sedation, and nursing, and recovery takes weeks.

FAQ

Is there a tetanus vaccine for dogs or cats?
Tetanus vaccination is not part of routine vaccine schedules for dogs or cats, because they are naturally fairly resistant to the disease.

Can my pet give tetanus to me?
No. Tetanus does not spread from animal to animal or from pets to people. It comes from spores in the environment entering a wound.

Does a rusty object cause tetanus?
Rust itself does not cause it. Any object that makes a deep, dirty wound, rusty or not, can carry the spores.