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Tetanus in Dogs

ByHenry R. Stämpfli, DMV, Dr Med Vet, DACVIM-LAIM, Department of Clinical Studies, Ontario Veterinary College, University of Guelph;
Bert E. Stromberg, PhD, Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota;J. P. Dubey, MVSc, PhD, Animal Parasitic Diseases Laboratory, Beltsville Agricultural Research Center, USDA;Paul Ettestad, DVM, MS, Epidemiology and Response Division, New Mexico Department of Health;Jodie Low Choy, BVSc, BVMS, IVAS Cert, Menzies School of Health Research; University Avenue Veterinary Hospital, Northern Territory, Australia;Joseph Taboada, DVM, DACVIM, Office of Student and Academic Affairs, School of Veterinary Medicine, Louisiana State University;Charles O. Thoen, DVM, PhD, Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University;John F. Timoney, MVB, PhD, Department of Veterinary Science, College of Agriculture, Food and Environment, University of Kentucky;Ian Rodney Tizard, BVMS, BSc, PhD, DSc (Hons), DACVM, Department of Veterinary Pathobiology, College of Veterinary and Biomedical Sciences, Texas A&M University;Geoffrey W. Smith, DVM, PhD, DACVIM-LAIM, Zoetis;Martin E. Hugh-Jones, VetMB, MPH, PhD, MRCVS, School of Veterinary Medicine, Louisiana State University;Henry R. Stämpfli, DMV, Dr Med Vet, DACVIM-LAIM, Department of Clinical Studies, Ontario Veterinary College, University of Guelph;Kate E. Creevy, DVM, MS, DACVIM-SAIM, College of Veterinary Medicine & Biomedical Sciences, Texas A & M University;Gad Baneth, DVM, PhD, DECVCP, Koret School of Veterinary Medicine, Hebrew University, Rehovot;Katharine F. Lunn, BVMS, PhD, DACVIM-SAIM, Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University;Reinhard K. Straubinger, DrMedVetHabil, PhD, Institute for Infectious Diseases and Zoonoses, Department of Veterinary Sciences, Faculty of Veterinary Medicine, LMU;Jodie Low Choy, BVSc, BVMS, IVAS Cert, Menzies School of Health Research; University Avenue Veterinary Hospital, Northern Territory, Australia;Manuals Staff;Márcio Garcia Ribeiro, DVM, PhD, Department of Animal Production and Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, SP, Brazil;Thomas Wittek, Dr Med Vet, DECBHM, University Clinic for Ruminants, Department of Farm Animals and Veterinary Public Health, University of Veterinary Medicine, Vienna;Yasuko Rikihisa, PhD, Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University;Janet E. Foley, DVM, PhD, Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis
Reviewed/Revised Jun 2018 | Modified Sept 2024

Tetanus toxemia is caused by a specific poison, or toxin, that blocks inhibitory nerve signals, leading to severe muscle contractions and exaggerated muscle responses to stimuli. The toxin is produced by Clostridium tetani bacteria in dead tissue. Almost all mammals are susceptible to this disease, although dogs are relatively resistant.

Clostridium tetani is found in soil and intestinal tracts. In most cases, it is introduced into the body through wounds, particularly deep puncture wounds. Sometimes, the point of entry cannot be found because the wound itself may be minor or healed. The bacteria remain in the dead tissue at the original site of infection and multiply. As bacterial cells die and disintegrate, the potent nerve toxin is released. The toxin causes convulsions of the voluntary muscles.

Tetanus, stiff legs, dog

The incubation period varies from 1 to several weeks but usually averages 10 to 14 days. Localized stiffness, often involving the jaw muscles and muscles of the neck, the hind limbs, and the region of the infected wound, is seen first. General stiffness becomes pronounced about 1 day later, and then spasms and painful sensitivity to touch become evident. Spasms are often triggered by sudden movement or noise. Because of their high resistance to tetanus toxin, dogs often have a long incubation period and frequently develop tetanus that is localized to the area of the wound, such as stiffness and rigidity in the limb with a wound. The stiffness can spread to the opposite leg then progress toward the head. When generalized tetanus does develop, the ears are erect, the tail is stiff and extended, and the mouth is partially open with the lips drawn back.

Tetanus is diagnosed based on an animal's history of having a wound and the presence of the signs. Laboratory tests may sometimes also be necessary. In the early stages of the disease, your veterinarian may recommend muscle relaxants, tranquilizers, or sedatives along with tetanus antitoxin. This treatment is supported by draining and cleaning the wounds and administering antibiotics.

Good nursing is invaluable during the early period of spasms. If your pet has tetanus and will be returning home with you rather than staying in a clinic, be sure to follow the nursing care instructions fully and carefully.

Also see professional content regarding tetanus.

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