Which virus has been implicated in the development of transmissible venereal tumor (TVT) in dogs?

The development of transmissible venereal tumor (TVT) in dogs is directly associated with the canine transmissible venereal tumor virus. This unique virus is not similar to typical viral infections; rather, it is a contagious tumor that can be spread through sexual contact, leading to tumors primarily affecting the genital area.

TVT cells are tumor cells that have acquired viral features and can be transferred between dogs, which is fundamentally different from the usual viral infections that might cause disease. No other viruses listed are linked to TVT; they have their separate pathologies and are not involved in the tumor's transmission or etiology. This specificity highlights the singular role of the canine transmissible venereal tumor virus in the pathogenesis of TVT among canines.