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Tuberculosis in Dogs

ByCharles O. Thoen, DVM, PhD, Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University;
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

Tuberculosis is an infectious disease caused by bacteria of the genus Mycobacterium. The disease affects practically all species of vertebrates, and, before control measures were adopted, was a major disease of people and domestic animals. Signs and lesions are generally similar in the various species. Although commonly defined as a longterm, debilitating disease, tuberculosis occasionally has a sudden, rapidly progressive course.

There are several species of bacteria that cause tuberculosis. Each type is mainly found in one host species but may produce infection in other host species. The types that affect dogs include Mycobacterium tuberculosis, Mycobacterium bovis, and occasionally Mycobacterium avium complex and Mycobacterium fortuitum.

The breathing in of infected droplets expelled from the lungs of an infected person or animal is the usual—though not the only—route of infection. Ingestion, particularly via contaminated food or milk, may also be a common source of infection.

Most infected dogs do not have any signs, as the canine immune system actively suppresses the bacteria. When disease does occur, signs generally include chronic coughing with difficulty breathing or quick, shallow breaths. Other generalized signs include progressive emaciation, lethargy, weakness, poor appetite, and a low-grade, fluctuating fever.

The disease is easily transmitted to humans and other animals and represents a public health risk. Therefore, treatment of tuberculosis in dogs should be discussed with your veterinarian. If a dog is suspected of having advanced tuberculous lesions, it must be reported to the appropriate public health authorities, and the dog should be euthanized.

Also see professional content regarding tuberculosis in dogs.

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