The resilience of ecosystems is being challenged by the thinning boundaries between domestic and wild animals.
The epidemiology of diseases caused by a number of infectious agents is undergoing profound readjustments.
Substantial risk exists for diseases of wildlife to spread to domestic carnivores and vice versa, and for zoonotic agents to emerge or re-emerge in human populations.
In the first part of this two-part article, we review the role wild canids and felids may play in the transmission of protozoa and arthropod-borne agents to dogs and cats in Europe.