This article is from the Keeshonden Breed FAQ, by firstname.lastname@example.org (Kimberly J. Eashoo).
Keeshonden are not as prone to epilepsy, a neurological seizure
disorder, as they once were. Unfortunately, there is no test for this.
Ask the breeder if there are any known epilepsy problems with dogs in
your Keeshond's pedigree. Ethical breeders will be more than happy to
discuss this with you.