Augustus is the grandest name in this entire rank cluster — four Latin syllables that belonged to Rome's first emperor. On a dog, it's either an earnest statement of regal aspiration or the best possible joke, depending on the size of the dog and the seriousness of the owner. Either reading produces a great outcome.
The Imperial Latin Heritage
Augustus Caesar transformed the Roman Republic into the Empire and gave his name to a month, a legacy, and an adjective ("august" meaning majestic). Pet owners who choose this name are usually making a deliberate point about how they see their dog — which is with maximum affection and some theatrical flair. Large, imposing breeds suit the name earnestly: Great Danes, Mastiffs, and Saint Bernards.
The Wes Anderson Angle
The character Augustus Waters in The Fault in Our Stars brought the name to a contemporary YA audience, giving it a slightly melancholic romantic register alongside the imperial one. That duality — grand and tender — is part of what makes it interesting on a dog.
Practical Nickname Reality
Augustus shortens to Auggie or Gus for daily use, and Gus especially is a strong standalone name. The full Augustus is a commitment you make on the vet registration and use for dramatic effect. See human usage trends at our Augustus page.