The number of cases of mycobacterial infections being recognised in small companion animals is slowly increasing, although it should be borne in mind that the number of confirmed cases of M. bovis remains very low. However, in view of the public health implications, it is important that veterinary surgeons have access to accurate information on which to base decisions related to diagnosis and management in order to provide accurate advice to their clients. Last reviewed 2016. The information in this SID is still valid as far as BSAVA Scientific Committee is aware but is not under active review at this time. The Committee will review this content if any new information comes to light.