It is often diagnosed among younger dogs that live in a kennel or shelter where they come in direct contact with other infected dogs. (dog-health-guide.org)
It's spread through direct contact with saliva, eye or nose discharge, or sometimes the feces of infected cats. (cat-health-guide.org)
The disease is transmitted by direct contact with infected rabbits, rabbit products, rodents, and contamination of cages, dishes, and clothing. (brittonroadveterinaryclinic.com)