Distribution and incidence of canine heartworm (Dirofilaria immitis) in Europe, and case reports of autochthonous feline infections. The isolated spots are for the Canary islands.
Please note that blanks mean “no published records”, not that infection is absent.
Source:
Trotz-Williams, L. A., Trees, A. J. (2003). Systematic review of the distribution of the major vector-borne parasitic infections in dogs and cats in Europe. Veterinary Record 152: 97-105.