Ross is a single-syllable name that operates entirely in the deadpan register: it sounds like a middle manager, a guy who brings sensible shoes to every occasion, and a person who has a lot of opinions about proper procedure. Naming a dog Ross is a quiet joke with a very specific punchline, and it has been landing since Friends made the name synonymous with a particular flavor of earnest over-explanation.
The Friends Effect
Ross Geller — paleontologist, three-time divorcé, and the character whose famous "WE WERE ON A BREAK" has outlived the show by decades — gave Ross a specific cultural character that has proven remarkably durable. A dog named Ross after this character is implicitly a dog who takes things slightly too seriously and will remind you of the rules even when you didn't ask. The human name Ross is rarely given to American babies now, which clears the collision path entirely.
Sound Economy
ROSS is clean and commanding as a single syllable — it doesn't blur into commands, it carries well, and it ends in a hard consonant that dogs respond to. Corgis and dogs with a slightly formal bearing carry it well.
Counter-Reading: Ceiling on Warmth
Ross is not a warm name. It's competent, reliable, and slightly stiff — which is fine if that's the energy you want, but owners who want a name that sounds affectionate when called should look elsewhere. Rudy or Rex covers similar male single-syllable ground with more warmth.