Prevalence of osteosarcoma and investigation of risk factors in military working dogs: a retrospective study using data from the Deceased Military Working Dog Database.

A retrospective study of military working dogs (MWDs) that were on active duty within the Department of Defense from 2000 to 2023 was conducted for the prevalence of osteosarcoma (OSA), histological subtypes and metastatic potential, and to examine potential risk factors. The prevalence of OSA in privately owned dogs (ie, pets of Department of Defense beneficiaries) that were patients of veterinary treatment facilities from 2000 to 2023 was used as a control. Between 2000 and 2023, 2,220 deceased MWD records had pathology data available for review, 27 of which had OSA (1.

Viral and squamous papillomas in captive polar bears ().

Papillomas, many of which are virally induced, are common proliferative cutaneous and mucocutaneous lesions in multiple species, exhibiting characteristic histologic cytopathic changes that distinguish them from nonviral squamous papillomas. A single case report of a novel papillomavirus, Ursus maritimus papillomavirus-type 1, in a polar bear has been reported without investigation into any association between this virus and papilloma formation. We identified papillomas in 3 polar bears.