- McKie imagined the Bureau's Director of Discretion, a suave little Laclac sitting in that nicely tailored environment back at Central. Siker would be relaxed, fighting tendril withdrawn, his face split open, an elite chairdog ministering to his flesh, trained minions a button-push away. - 1970, page 67 of Whipping Star by Frank Herbert.
In the Dune universe, the object and species known as chairdogs were first mentioned in Heretics of Dune.
Described in more detail in Whipping Star, these were bio-engineered dogs shaped into chairs. They were trained to massage the people who sat in them, similar to modern-day vibrating massage chairs, except without needing electricity or computerization.