Gus sits at #104 with 973 entries and is one of the most concentrated old-man-energy names in the rankings. Owners reach for Gus when the dog already looks slightly weary and slightly wise. Bulldogs, basset hounds, beagles, and senior rescues. The name is asking the dog to be a character, and the dog usually obliges.
The grandfather-name register
Gus belongs to a small cluster of short, gruff, old-fashioned male pet names: Gus, Oscar, Frank, Winston, and Murph. These names share an aesthetic: they sound like they belong to a man who has been around. Owners who pick Gus are usually choosing into that texture deliberately. The name almost never lands on a puppy without irony.
One counter-reading worth flagging: Cinderella features a mouse named Gus, which gives the name a softer secondary association for owners who absorbed Disney as kids. That register is doing quiet work alongside the gruff-grandfather register, and the two readings often coexist in the same household.
Why one syllable hits hard
Gus is a single syllable opening on a hard G and closing on a clean S. There is no shorter or sharper structure in the rankings. Dogs lock onto it instantly, and the name carries the same recall properties as Rex and Max. The phonetic engineering is part of why the name has held a top-200 slot for decades despite never breaking into the upper tier.
The human Gus is usually short for Gustav or Augustus, both of which are climbing on SSA charts. The Augustus page shows the formal version.