What kind of insurance do my dogs need?

I have two dogs- aged 18 months and 6 months, mother and daughter. The younger one keeps getting pneumonia after getting a cough whilst in the shelter before we adopted her. The vets bills are pretty high- does anyone know where we can get pet insurance in Spain which will cover her pre-existing pneumonia problem? They are well looked after, kept warm and fed properly so people who want to pick holes in my animal care don't bother/