Where are police dogs kept when not on duty?

So this is a question I've had for years. Where are police dogs kept when not on duty? Are they kept in a separate part of the police station that's sort of like a kennel? Kind of like how research scientists keep monkeys and rodents on one floor while they work on another floor? Or does someone else preside over the dogs until the cops need them? Upon which said person then brings the dogs to the station so the officers can prepare them for their latest job?