The Keeshond (/ˈkeɪshɒnd/ KAYSS-hond, plur. Keeshonden) is a medium-sized dog with a plush, two-layer coat of silver and black fur with a ruff and a curled tail. They need daily contact with their owners and lots of activity to remain happy. Keeshonden do not live happily alone in a kennel or backyard. Though congenital health issues are not common, the conditions which have been known to sometimes occur in Keeshonden are hip dysplasia, luxating patellas (trick knee), epilepsy, Cushing's disease, diabetes, primary hyperparathyroidism, and hypothyroidism. Though congenital health issues are not common, the conditions which have been known to sometimes occur in Keeshonden are hip dysplasia, luxating patellas (trick knee), epilepsy, Cushing's disease, diabetes, primary hyperparathyroidism, and hypothyroidism.