What's wrong with Baron?

Hi All,
Things are pleasantly quiet since Baron's last training session. He is well-behaved on our outings and doesn't even bark at the Burmese Mountain Dog. He walks beside me as though he's participating in an obedience trial. He enters stores and his behavior is exemplary.
His greeting of guests to our home has been appropriate (no jumping or frisking the guest for treats). He is responsive to my commands. Things are heavenly here at Poodle Place.
WHAT IS WRONG WITH BARON?
Denise (trainer #5) said Baron's snarling at his new friend, Barkley, is indicative that,at 2 years old, he is an adult dog correcting a young dog. That sounds good to me!
Maybe Baron is a grown-up - who knew?
Keep your fingers crossed.
Hopefully,
Botswain
PS
It is almost too quiet here at Poodle Place.